[ci skip] Add Vietnamese characters to foreign_chars.php
diff --git a/application/config/foreign_chars.php b/application/config/foreign_chars.php
index 41de123..6614caa 100644
--- a/application/config/foreign_chars.php
+++ b/application/config/foreign_chars.php
@@ -40,20 +40,20 @@
 	'/Ä/' => 'Ae',
 	'/Ü/' => 'Ue',
 	'/Ö/' => 'Oe',
-	'/À|Á|Â|Ã|Ä|Å|Ǻ|Ā|Ă|Ą|Ǎ|Α|Ά/' => 'A',
-	'/à|á|â|ã|å|ǻ|ā|ă|ą|ǎ|ª|α|ά/' => 'a',
+	'/À|Á|Â|Ã|Ä|Å|Ǻ|Ā|Ă|Ą|Ǎ|Α|Ά|Ả|Ạ|Ầ|Ẫ|Ẩ|Ậ|Ằ|Ắ|Ẵ|Ẳ|Ặ/' => 'A',
+	'/à|á|â|ã|å|ǻ|ā|ă|ą|ǎ|ª|α|ά|ả|ạ|ầ|ấ|ẫ|ẩ|ậ|ằ|ắ|ẵ|ẳ|ặ/' => 'a',
 	'/Ç|Ć|Ĉ|Ċ|Č/' => 'C',
 	'/ç|ć|ĉ|ċ|č/' => 'c',
 	'/Ð|Ď|Đ|Δ/' => 'Dj',
 	'/ð|ď|đ|δ/' => 'dj',
-	'/È|É|Ê|Ë|Ē|Ĕ|Ė|Ę|Ě|Ε|Έ/' => 'E',
-	'/è|é|ê|ë|ē|ĕ|ė|ę|ě|έ|ε/' => 'e',
+	'/È|É|Ê|Ë|Ē|Ĕ|Ė|Ę|Ě|Ε|Έ|Ẽ|Ẻ|Ẹ|Ề|Ế|Ễ|Ể|Ệ/' => 'E',
+	'/è|é|ê|ë|ē|ĕ|ė|ę|ě|έ|ε|ẽ|ẻ|ẹ|ề|ế|ễ|ể|ệ/' => 'e',
 	'/Ĝ|Ğ|Ġ|Ģ|Γ/' => 'G',
 	'/ĝ|ğ|ġ|ģ|γ/' => 'g',
 	'/Ĥ|Ħ/' => 'H',
 	'/ĥ|ħ/' => 'h',
-	'/Ì|Í|Î|Ï|Ĩ|Ī|Ĭ|Ǐ|Į|İ|Η|Ή|Ί|Ι|Ϊ/' => 'I',
-	'/ì|í|î|ï|ĩ|ī|ĭ|ǐ|į|ı|η|ή|ί|ι|ϊ/' => 'i',
+	'/Ì|Í|Î|Ï|Ĩ|Ī|Ĭ|Ǐ|Į|İ|Η|Ή|Ί|Ι|Ϊ|Ỉ|Ị/' => 'I',
+	'/ì|í|î|ï|ĩ|ī|ĭ|ǐ|į|ı|η|ή|ί|ι|ϊ|ỉ|ị/' => 'i',
 	'/Ĵ/' => 'J',
 	'/ĵ/' => 'j',
 	'/Ķ|Κ/' => 'K',
@@ -62,18 +62,18 @@
 	'/ĺ|ļ|ľ|ŀ|ł|λ/' => 'l',
 	'/Ñ|Ń|Ņ|Ň|Ν/' => 'N',
 	'/ñ|ń|ņ|ň|ʼn|ν/' => 'n',
-	'/Ò|Ó|Ô|Õ|Ō|Ŏ|Ǒ|Ő|Ơ|Ø|Ǿ|Ο|Ό|Ω|Ώ/' => 'O',
-	'/ò|ó|ô|õ|ō|ŏ|ǒ|ő|ơ|ø|ǿ|º|ο|ό|ω|ώ/' => 'o',
+	'/Ò|Ó|Ô|Õ|Ō|Ŏ|Ǒ|Ő|Ơ|Ø|Ǿ|Ο|Ό|Ω|Ώ|Ỏ|Ọ|Ồ|Ố|Ỗ|Ổ|Ộ|Ờ|Ớ|Ỡ|Ở|Ợ/' => 'O',
+	'/ò|ó|ô|õ|ō|ŏ|ǒ|ő|ơ|ø|ǿ|º|ο|ό|ω|ώ|ỏ|ọ|ồ|ố|ỗ|ổ|ộ|ờ|ớ|ỡ|ở|ợ/' => 'o',
 	'/Ŕ|Ŗ|Ř|Ρ/' => 'R',
 	'/ŕ|ŗ|ř|ρ/' => 'r',
 	'/Ś|Ŝ|Ş|Ș|Š|Σ/' => 'S',
 	'/ś|ŝ|ş|ș|š|ſ|σ|ς/' => 's',
 	'/Ț|Ţ|Ť|Ŧ|τ/' => 'T',
 	'/ț|ţ|ť|ŧ/' => 't',
-	'/Ù|Ú|Û|Ũ|Ū|Ŭ|Ů|Ű|Ų|Ư|Ǔ|Ǖ|Ǘ|Ǚ|Ǜ/' => 'U',
-	'/ù|ú|û|ũ|ū|ŭ|ů|ű|ų|ư|ǔ|ǖ|ǘ|ǚ|ǜ|υ|ύ|ϋ/' => 'u',
-	'/Ý|Ÿ|Ŷ|Υ|Ύ|Ϋ/' => 'Y',
-	'/ý|ÿ|ŷ/' => 'y',
+	'/Ù|Ú|Û|Ũ|Ū|Ŭ|Ů|Ű|Ų|Ư|Ǔ|Ǖ|Ǘ|Ǚ|Ǜ|Ũ|Ủ|Ụ|Ừ|Ứ|Ữ|Ử|Ự/' => 'U',
+	'/ù|ú|û|ũ|ū|ŭ|ů|ű|ų|ư|ǔ|ǖ|ǘ|ǚ|ǜ|υ|ύ|ϋ|ủ|ụ|ừ|ứ|ữ|ử|ự/' => 'u',
+	'/Ý|Ÿ|Ŷ|Υ|Ύ|Ϋ|Ỳ|Ỹ|Ỷ|Ỵ/' => 'Y',
+	'/ý|ÿ|ŷ|ỳ|ỹ|ỷ|ỵ/' => 'y',
 	'/Ŵ/' => 'W',
 	'/ŵ/' => 'w',
 	'/Ź|Ż|Ž|Ζ/' => 'Z',