This addon allows UTF-8 friendly characters by preventing normalization of field contents during imports, edits, and browser searches. Media, tag, and deck names are normalized, for technical reasons.
Kanji, Hanzi, Hanja. JIS-3 character set and others.
神神祥祥 : Non-normalization form (Anki 2.0 default)
神神祥祥 : Normalization form (Anki 2.1 default)
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More info about this issue here.
"users may find they can't search for non-Latin text added on one platform that uses a different encoding to the platform they are currently on."