diff --git a/Duckling/Ranking/Classifiers/VI_XX.hs b/Duckling/Ranking/Classifiers/VI_XX.hs
index 00e98a5c..7391ddcf 100644
--- a/Duckling/Ranking/Classifiers/VI_XX.hs
+++ b/Duckling/Ranking/Classifiers/VI_XX.hs
@@ -41,10 +41,10 @@ classifiers
                                likelihoods = HashMap.fromList [], n = 0}}),
        ("integer (numeric)",
         Classifier{okData =
-                     ClassData{prior = -0.5108256237659907, unseen = -4.61512051684126,
-                               likelihoods = HashMap.fromList [("", 0.0)], n = 99},
+                     ClassData{prior = -0.5028732955754956, unseen = -4.634728988229636,
+                               likelihoods = HashMap.fromList [("", 0.0)], n = 101},
                    koData =
-                     ClassData{prior = -0.916290731874155, unseen = -4.219507705176107,
+                     ClassData{prior = -0.9283390703903296, unseen = -4.219507705176107,
                                likelihoods = HashMap.fromList [("", 0.0)], n = 66}}),
        ("exactly <time-of-day>",
         Classifier{okData =
@@ -93,21 +93,21 @@ classifiers
                                likelihoods = HashMap.fromList [("", 0.0)], n = 5}}),
        ("<part-of-day> <time>",
         Classifier{okData =
-                     ClassData{prior = -0.40546510810816444,
-                               unseen = -3.4657359027997265,
+                     ClassData{prior = -0.3746934494414107,
+                               unseen = -3.5263605246161616,
                                likelihoods =
                                  HashMap.fromList
-                                   [("hourday", -1.0360919316867756),
-                                    ("noonh\244m nay", -2.740840023925201),
-                                    ("lunchng\224y mai", -2.3353749158170367),
-                                    ("noonng\224y h\244m qua", -2.3353749158170367),
-                                    ("morningSunday", -2.740840023925201),
-                                    ("noonng\224y mai", -2.3353749158170367),
-                                    ("afternoonng\224y dd/mm", -2.740840023925201),
-                                    ("afternoonng\224y mai", -2.740840023925201)],
-                               n = 10},
+                                   [("hourday", -1.0116009116784799),
+                                    ("noonh\244m nay", -2.803360380906535),
+                                    ("lunchng\224y mai", -2.3978952727983707),
+                                    ("noonng\224y h\244m qua", -2.3978952727983707),
+                                    ("morningSunday", -2.3978952727983707),
+                                    ("noonng\224y mai", -2.3978952727983707),
+                                    ("afternoonng\224y dd/mm", -2.803360380906535),
+                                    ("afternoonng\224y mai", -2.803360380906535)],
+                               n = 11},
                    koData =
-                     ClassData{prior = -1.0986122886681098,
+                     ClassData{prior = -1.1631508098056809,
                                unseen = -3.0910424533583156,
                                likelihoods =
                                  HashMap.fromList
@@ -153,12 +153,11 @@ classifiers
                                likelihoods = HashMap.fromList [], n = 0}}),
        ("month (grain)",
         Classifier{okData =
-                     ClassData{prior = -1.4271163556401458,
-                               unseen = -2.0794415416798357,
+                     ClassData{prior = -1.466337068793427, unseen = -2.0794415416798357,
                                likelihoods = HashMap.fromList [("", 0.0)], n = 6},
                    koData =
-                     ClassData{prior = -0.2744368457017603, unseen = -3.044522437723423,
-                               likelihoods = HashMap.fromList [("", 0.0)], n = 19}}),
+                     ClassData{prior = -0.262364264467491, unseen = -3.0910424533583156,
+                               likelihoods = HashMap.fromList [("", 0.0)], n = 20}}),
        ("Wednesday",
         Classifier{okData =
                      ClassData{prior = 0.0, unseen = -1.3862943611198906,
@@ -190,65 +189,66 @@ classifiers
                                likelihoods = HashMap.fromList [("", 0.0)], n = 20}}),
        ("intersect",
         Classifier{okData =
-                     ClassData{prior = -0.24921579162398486,
-                               unseen = -5.017279836814924,
+                     ClassData{prior = -0.24512245803298496,
+                               unseen = -5.030437921392435,
                                likelihoods =
                                  HashMap.fromList
                                    [("<time-of-day> s\225ng|chi\7873u|t\7889ing\224y dd/mm",
-                                     -3.624340932976365),
-                                    ("hourday", -3.624340932976365), ("dayhour", -4.31748811353631),
+                                     -3.6375861597263857),
+                                    ("hourday", -3.6375861597263857),
+                                    ("dayhour", -4.330733340286331),
                                     ("h\244m nay<time-of-day> s\225ng|chi\7873u|t\7889i",
-                                     -4.31748811353631),
-                                    ("monthyear", -3.4011973816621555),
-                                    ("Wednesdaynext <cycle>", -4.31748811353631),
+                                     -4.330733340286331),
+                                    ("monthyear", -3.414442608412176),
+                                    ("Wednesdaynext <cycle>", -4.330733340286331),
                                     ("Tuesday<day-of-month> (numeric with day symbol) <named-month>",
-                                     -4.31748811353631),
-                                    ("time-of-day gi\7901<part-of-day> <time>", -4.31748811353631),
+                                     -4.330733340286331),
+                                    ("time-of-day gi\7901<part-of-day> <time>", -4.330733340286331),
                                     ("Sunday<day-of-month> (numeric with day symbol) <named-month>",
-                                     -3.912023005428146),
-                                    ("time-of-day gi\7901<time> n\224y", -4.31748811353631),
+                                     -3.6375861597263857),
+                                    ("time-of-day gi\7901<time> n\224y", -4.330733340286331),
                                     ("month (numeric with month symbol)year (numeric with year symbol)",
-                                     -3.624340932976365),
-                                    ("dayday", -2.6127400212978853),
-                                    ("hourhour", -3.4011973816621555),
+                                     -3.6375861597263857),
+                                    ("dayday", -2.538973871058276),
+                                    ("hourhour", -3.414442608412176),
                                     ("intersectyear (numeric with year symbol)",
-                                     -3.624340932976365),
-                                    ("dayyear", -2.445685936634719),
+                                     -3.6375861597263857),
+                                    ("dayyear", -2.4589311633847397),
                                     ("<ordinal> <cycle> of <time>year (numeric with year symbol)",
-                                     -4.31748811353631),
-                                    ("minutehour", -3.912023005428146),
+                                     -4.330733340286331),
+                                    ("minutehour", -3.925268232178167),
                                     ("<time-of-day> s\225ng|chi\7873u|t\7889iintersect",
-                                     -3.912023005428146),
-                                    ("Thursdaynext <cycle>", -3.912023005428146),
-                                    ("Octoberyear (numeric with year symbol)", -4.31748811353631),
+                                     -3.925268232178167),
+                                    ("Thursdaynext <cycle>", -3.925268232178167),
+                                    ("Octoberyear (numeric with year symbol)", -4.330733340286331),
                                     ("time-of-day gi\7901<part-of-day> (h\244m )?nay",
-                                     -4.31748811353631),
+                                     -4.330733340286331),
                                     ("<day-of-month> (numeric with day symbol) <named-month>year (numeric with year symbol)",
-                                     -3.2188758248682006),
+                                     -3.2321210516182215),
                                     ("<time-of-day> s\225ng|chi\7873u|t\7889i<day-of-month> (numeric with day symbol) <named-month>",
-                                     -3.4011973816621555),
-                                    ("time-of-day gi\7901tonight", -4.31748811353631),
-                                    ("minuteday", -2.8134107167600364),
-                                    ("hh:mm<part-of-day> <time>", -4.31748811353631),
+                                     -3.414442608412176),
+                                    ("time-of-day gi\7901tonight", -4.330733340286331),
+                                    ("minuteday", -2.826655943510057),
+                                    ("hh:mm<part-of-day> <time>", -4.330733340286331),
                                     ("<day-of-month> <named-month>year (numeric with year symbol)",
-                                     -3.2188758248682006),
-                                    ("Fridaythis <cycle>", -3.912023005428146),
-                                    ("Thursdaythis <cycle>", -4.31748811353631),
-                                    ("at hh:mm<part-of-day> <time>", -4.31748811353631),
-                                    ("dayweek", -3.0647251450409425),
-                                    ("weekyear", -4.31748811353631),
+                                     -3.2321210516182215),
+                                    ("Fridaythis <cycle>", -3.925268232178167),
+                                    ("Thursdaythis <cycle>", -4.330733340286331),
+                                    ("at hh:mm<part-of-day> <time>", -4.330733340286331),
+                                    ("dayweek", -3.077970371790963),
+                                    ("weekyear", -4.330733340286331),
                                     ("<time-of-day> s\225ng|chi\7873u|t\7889ing\224y dd/mm/yyyy",
-                                     -4.31748811353631),
+                                     -4.330733340286331),
                                     ("<time-of-day> s\225ng|chi\7873u|t\7889ing\224y mai",
-                                     -4.31748811353631),
-                                    ("Tuesdayintersect", -4.31748811353631),
+                                     -4.330733340286331),
+                                    ("Tuesdayintersect", -4.330733340286331),
                                     ("Monday<day-of-month> (numeric with day symbol) <named-month>",
-                                     -3.0647251450409425),
-                                    ("seasonthis <cycle>", -4.31748811353631),
-                                    ("minuteyear", -3.912023005428146)],
-                               n = 53},
+                                     -3.077970371790963),
+                                    ("seasonthis <cycle>", -4.330733340286331),
+                                    ("minuteyear", -3.925268232178167)],
+                               n = 54},
                    koData =
-                     ClassData{prior = -1.5114575040738967, unseen = -4.31748811353631,
+                     ClassData{prior = -1.5260563034950494, unseen = -4.31748811353631,
                                likelihoods =
                                  HashMap.fromList
                                    [("<time-of-day> s\225ng|chi\7873u|t\7889ing\224y dd/mm",
@@ -533,12 +533,12 @@ classifiers
                                likelihoods = HashMap.fromList [], n = 0}}),
        ("month (numeric with month symbol)",
         Classifier{okData =
-                     ClassData{prior = 0.0, unseen = -3.4339872044851463,
+                     ClassData{prior = 0.0, unseen = -3.4657359027997265,
                                likelihoods =
                                  HashMap.fromList
-                                   [("integer (numeric)", -0.2231435513142097),
-                                    ("integer (0..19)", -1.6094379124341003)],
-                               n = 28},
+                                   [("integer (numeric)", -0.21511137961694557),
+                                    ("integer (0..19)", -1.6422277352570913)],
+                               n = 29},
                    koData =
                      ClassData{prior = -infinity, unseen = -1.0986122886681098,
                                likelihoods = HashMap.fromList [], n = 0}}),
@@ -592,8 +592,8 @@ classifiers
                                likelihoods = HashMap.fromList [("", 0.0)], n = 11}}),
        ("Sunday",
         Classifier{okData =
-                     ClassData{prior = 0.0, unseen = -1.791759469228055,
-                               likelihoods = HashMap.fromList [("", 0.0)], n = 4},
+                     ClassData{prior = 0.0, unseen = -2.1972245773362196,
+                               likelihoods = HashMap.fromList [("", 0.0)], n = 7},
                    koData =
                      ClassData{prior = -infinity, unseen = -0.6931471805599453,
                                likelihoods = HashMap.fromList [], n = 0}}),
@@ -690,27 +690,27 @@ classifiers
                      ClassData{prior = -infinity, unseen = -2.995732273553991,
                                likelihoods = HashMap.fromList [], n = 0},
                    koData =
-                     ClassData{prior = 0.0, unseen = -5.225746673713201,
+                     ClassData{prior = 0.0, unseen = -5.236441962829949,
                                likelihoods =
                                  HashMap.fromList
-                                   [("week", -3.42859635585027),
-                                    ("integer (0..19)year (grain)", -4.527208644518379),
-                                    ("integer (numeric)day (grain)", -3.0231312477421053),
-                                    ("integer (0..19)hour (grain)", -3.834061463958434),
-                                    ("second", -3.6109179126442243),
-                                    ("integer (numeric)second (grain)", -3.6109179126442243),
-                                    ("integer (numeric)year (grain)", -2.655406467616788),
-                                    ("day", -2.822460552279954), ("year", -2.581298495463066),
-                                    ("integer (numeric)week (grain)", -4.121743536410215),
-                                    ("integer (0..19)month (grain)", -4.527208644518379),
-                                    ("hour", -2.001480000210124), ("month", -2.042301994730379),
-                                    ("integer (numeric)minute (grain)", -3.6109179126442243),
-                                    ("integer (numeric)month (grain)", -2.084861609149175),
-                                    ("minute", -3.6109179126442243),
-                                    ("integer (numeric)hour (grain)", -2.129313371720009),
-                                    ("integer (0..19)day (grain)", -4.121743536410215),
-                                    ("integer (0..19)week (grain)", -3.834061463958434)],
-                               n = 83}}),
+                                   [("week", -3.4393491476265314),
+                                    ("integer (0..19)year (grain)", -4.537961436294641),
+                                    ("integer (numeric)day (grain)", -3.0338840395183673),
+                                    ("integer (0..19)hour (grain)", -3.844814255734696),
+                                    ("second", -3.6216707044204863),
+                                    ("integer (numeric)second (grain)", -3.6216707044204863),
+                                    ("integer (numeric)year (grain)", -2.66615925939305),
+                                    ("day", -2.833213344056216), ("year", -2.592051287239328),
+                                    ("integer (numeric)week (grain)", -4.132496328186477),
+                                    ("integer (0..19)month (grain)", -4.537961436294641),
+                                    ("hour", -2.012232791986386), ("month", -2.012232791986386),
+                                    ("integer (numeric)minute (grain)", -3.6216707044204863),
+                                    ("integer (numeric)month (grain)", -2.053054786506641),
+                                    ("minute", -3.6216707044204863),
+                                    ("integer (numeric)hour (grain)", -2.1400661634962708),
+                                    ("integer (0..19)day (grain)", -4.132496328186477),
+                                    ("integer (0..19)week (grain)", -3.844814255734696)],
+                               n = 84}}),
        ("<time-of-day> am|pm",
         Classifier{okData =
                      ClassData{prior = 0.0, unseen = -1.6094379124341003,
@@ -857,17 +857,17 @@ classifiers
                                n = 2}}),
        ("<day-of-month> <named-month>",
         Classifier{okData =
-                     ClassData{prior = -0.10008345855698253,
-                               unseen = -3.7376696182833684,
+                     ClassData{prior = -9.53101798043249e-2,
+                               unseen = -3.784189633918261,
                                likelihoods =
                                  HashMap.fromList
                                    [("integer (numeric)month (numeric with month symbol)",
-                                     -0.8232003088081431),
-                                    ("month", -0.7178397931503169),
-                                    ("integer (numeric)March", -2.6149597780361984)],
-                               n = 19},
+                                     -0.8167611365271219),
+                                    ("month", -0.7166776779701395),
+                                    ("integer (numeric)March", -2.662587827025453)],
+                               n = 20},
                    koData =
-                     ClassData{prior = -2.3513752571634776,
+                     ClassData{prior = -2.3978952727983707,
                                unseen = -2.0794415416798357,
                                likelihoods =
                                  HashMap.fromList
@@ -911,8 +911,8 @@ classifiers
                                likelihoods = HashMap.fromList [], n = 0}}),
        ("morning",
         Classifier{okData =
-                     ClassData{prior = 0.0, unseen = -1.3862943611198906,
-                               likelihoods = HashMap.fromList [("", 0.0)], n = 2},
+                     ClassData{prior = 0.0, unseen = -1.6094379124341003,
+                               likelihoods = HashMap.fromList [("", 0.0)], n = 3},
                    koData =
                      ClassData{prior = -infinity, unseen = -0.6931471805599453,
                                likelihoods = HashMap.fromList [], n = 0}}),
@@ -938,14 +938,14 @@ classifiers
                                likelihoods = HashMap.fromList [], n = 0}}),
        ("<day-of-month> (numeric with day symbol) <named-month>",
         Classifier{okData =
-                     ClassData{prior = 0.0, unseen = -3.784189633918261,
+                     ClassData{prior = 0.0, unseen = -3.828641396489095,
                                likelihoods =
                                  HashMap.fromList
                                    [("integer (numeric)month (numeric with month symbol)",
-                                     -0.8167611365271219),
-                                    ("month", -0.7166776779701395),
-                                    ("integer (numeric)March", -2.662587827025453)],
-                               n = 20},
+                                     -0.8109302162163288),
+                                    ("month", -0.7156200364120039),
+                                    ("integer (numeric)March", -2.70805020110221)],
+                               n = 21},
                    koData =
                      ClassData{prior = -infinity, unseen = -1.3862943611198906,
                                likelihoods = HashMap.fromList [], n = 0}})]
\ No newline at end of file
diff --git a/Duckling/Time/VI/Corpus.hs b/Duckling/Time/VI/Corpus.hs
index 1b465190..aa3d591e 100644
--- a/Duckling/Time/VI/Corpus.hs
+++ b/Duckling/Time/VI/Corpus.hs
@@ -75,6 +75,7 @@ allExamples = concat
              ]
   , examples (datetime (2017, 2, 5, 0, 0, 0) Day)
              [ "chủ nhật"
+             , "chúa nhật"
              ]
   , examples (datetime (2017, 6, 1, 0, 0, 0) Month)
              [ "tháng 6"
@@ -124,6 +125,7 @@ allExamples = concat
   , examples (datetime (2017, 4, 9, 0, 0, 0) Day)
              [ "chủ nhật ngày mồng 9 tháng 4"
              , "chủ nhật ngày 9 tháng 4"
+             , "chúa nhật ngày 9 tháng 4"
              ]
   , examples (datetime (2017, 2, 6, 0, 0, 0) Day)
              [ "thứ 2 ngày 6 tháng 2"
@@ -292,6 +294,7 @@ allExamples = concat
              ]
   , examples (datetimeInterval ((2017, 2, 5, 4, 0, 0), (2017, 2, 5, 12, 0, 0)) Hour)
              [ "sáng chủ nhật"
+             , "sáng chúa nhật"
              ]
   , examples (datetimeInterval ((2017, 2, 2, 3, 54, 58), (2017, 2, 2, 3, 55, 0)) Second)
              [ "2 giây vừa rồi"
diff --git a/Duckling/Time/VI/Rules.hs b/Duckling/Time/VI/Rules.hs
index b97d79de..0c571eb4 100644
--- a/Duckling/Time/VI/Rules.hs
+++ b/Duckling/Time/VI/Rules.hs
@@ -47,7 +47,7 @@ ruleDaysOfWeek = mkRuleDaysOfWeek
   , ( "Thursday" , "th(ứ) (5|n(ă)m)"                )
   , ( "Friday"   , "th(ứ) 6|th(ứ) s(á)u"            )
   , ( "Saturday" , "th(ứ) (7|b((ả)|(ẩ))y)"          )
-  , ( "Sunday"   , "ch(ủ) nh(ậ)t"                   )
+  , ( "Sunday"   , "ch((ủ)|(ú)a) nh(ậ)t"            )
   ]
 
 ruleMonths :: [Rule]