No installation, real-time collaboration, version control, hundreds of LaTeX You can intersperse math, Chinese and English (Latin script) without adding extra.
Different packages exist to support Japanese typesetting for various LaTeX which enables utf8 encoding for Chinese, Japanese and Korean characters.
I don't know whether any fonts available for use with pdftex contain the characters you need. But if you compile with luatex or xetex rather than.
I use LaTeX + CJK and it works fine. Make sure your text editor supports unicode, and then add these lines between the \documentclass and.