Perhaps you should try some spelling variations:
wang yuan » wang yuhan, wang yan, fang yuan
sang minh » kang minah, anh minh, song min
yuan kai » yuan kang, yuan fei, tan kai
kai chai » ka chai, goi chai, kim chai
chai tan » chai tam, chai onn
tan sang » tan yang, tang tang, tan hong
chang ha » chang mae

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yuan kai chai tan sang minh ((dang hai) or (chang ha)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yuan kai chai tan sang minh ((dang hai) OR (chang ha)) ;*.