Perhaps you should try some spelling variations:
wang oanh » wang yan, wang yang, dang anh
chen yang » chen rong
yang john » young john, king john, yang jin
tran hua » tuan hua, tran duc
john bon » john bonn, john b, john bee
tan hua » tuan hua, tan chia, tan puay
bon a » bonn a, von a, ben a

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang oanh ((tran hua) or (((tan hua) or (wang hua)))) chen yang john bon a ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang oanh ((tran hua) OR (((tan hua) OR (wang hua)))) chen yang john bon a ;.
• Adding a wildcard symbol may retrieve word variants: wang oanh ((tran hua) or (((tan hua) or (wang hua)))) chen yang john bon a ;*.