diff --git a/src/Stringy.php b/src/Stringy.php
index ccb6f5a..a4217d9 100644
--- a/src/Stringy.php
+++ b/src/Stringy.php
@@ -1728,7 +1728,7 @@ protected function charsArray()
             'o'     => ['ó', 'ò', 'ỏ', 'õ', 'ọ', 'ô', 'ố', 'ồ', 'ổ', 'ỗ',
                         'ộ', 'ơ', 'ớ', 'ờ', 'ở', 'ỡ', 'ợ', 'ø', 'ō', 'ő',
                         'ŏ', 'ο', 'ὀ', 'ὁ', 'ὂ', 'ὃ', 'ὄ', 'ὅ', 'ὸ', 'ό',
-                        'о', 'و', 'θ', 'ို', 'ǒ', 'ǿ', 'º', 'ო', 'ओ', 'ｏ',
+                        'о', 'و', 'ို', 'ǒ', 'ǿ', 'º', 'ო', 'ओ', 'ｏ',
                         'ö'],
             'p'     => ['п', 'π', 'ပ', 'პ', 'پ', 'ｐ'],
             'q'     => ['ყ', 'ｑ'],
@@ -1768,7 +1768,7 @@ protected function charsArray()
             'shch'  => ['щ'],
             'ss'    => ['ß'],
             'sx'    => ['ŝ'],
-            'th'    => ['þ', 'ϑ', 'ث', 'ذ', 'ظ'],
+            'th'    => ['þ', 'ϑ', 'θ', 'ث', 'ذ', 'ظ'],
             'ts'    => ['ц', 'ც', 'წ'],
             'uu'    => ['ऊ'],
             'ya'    => ['я'],
@@ -1803,7 +1803,7 @@ protected function charsArray()
             'O'     => ['Ó', 'Ò', 'Ỏ', 'Õ', 'Ọ', 'Ô', 'Ố', 'Ồ', 'Ổ', 'Ỗ',
                         'Ộ', 'Ơ', 'Ớ', 'Ờ', 'Ở', 'Ỡ', 'Ợ', 'Ø', 'Ō', 'Ő',
                         'Ŏ', 'Ο', 'Ό', 'Ὀ', 'Ὁ', 'Ὂ', 'Ὃ', 'Ὄ', 'Ὅ', 'Ὸ',
-                        'Ό', 'О', 'Θ', 'Ө', 'Ǒ', 'Ǿ', 'Ｏ', 'Ö'],
+                        'Ό', 'О', 'Ө', 'Ǒ', 'Ǿ', 'Ｏ', 'Ö'],
             'P'     => ['П', 'Π', 'Ｐ'],
             'Q'     => ['Ｑ'],
             'R'     => ['Ř', 'Ŕ', 'Р', 'Ρ', 'Ŗ', 'Ｒ'],
@@ -1834,7 +1834,7 @@ protected function charsArray()
             'Sh'    => ['Ш'],
             'Shch'  => ['Щ'],
             'Ss'    => ['ẞ'],
-            'Th'    => ['Þ'],
+            'Th'    => ['Þ', 'Θ'],
             'Ts'    => ['Ц'],
             'Ya'    => ['Я'],
             'Yu'    => ['Ю'],