Perhaps you should try some spelling variations:
wang oanh » wang yan, dang anh, wang ban
wang yang » wang yan, wang liang, wang yanling
yang john » young john, king john, yang jun
yang jin » yang jie, yang jun, ying jin
wong sam » wong sau, wong lai, kong sar
tran a » tran _, tran dat, tran nam
a chen » ta chen, _ chen, n chen

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) or (wang yang)) tran a chen ((yang john) or (yang jin)) wong sam ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang oanh) OR (wang yang)) tran a chen ((yang john) OR (yang jin)) wong sam ;.
• Adding a wildcard symbol may retrieve word variants: ((wang oanh) or (wang yang)) tran a chen ((yang john) or (yang jin)) wong sam ;*.