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
john wong » john song, john bonn
tran hua » tuan hua, tran duc
wong sam » wong sau, wong lai, kong sar
tan hua » tuan hua, wang hua, tan chia

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)) chen yang john wong sam ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang oanh ((tran hua) OR (tan hua)) chen yang john wong sam ;".
• Adding a wildcard symbol may retrieve word variants: wang oanh ((tran hua) OR (tan hua)) chen yang john wong sam ;*.