basically, refer to this article:
but when you cant’t search any text, you may try “array of byte”.
first, encode your text. visit this site and type your text. e.g. アイドルマスター (note: sub-string of text is recommended, rahter tan full text(like アイドルマスター大好き！). text might be truncated and in that case your search will fail.) and submit.
after submit, you will see several bytecodes. for worst case, you might have to try them all, but sjis-hex is a good starting point. sjis-hex value of above text is: 83 41 83 43 83 68 83 8B 83 7D 83 58 83 5E 81 5B . copy this value.
go back to cheat engine, and select type to “Array of byte”, and paste it to value textbox. then press “first scan”.
if you are lucky, you may got some result. good luck and good digging!
references:
hex -> text convert (decode) page
text -> hex convert (encode) page