Perhaps you should try some spelling variations:
wang oanh » wang yan, wang yang, dang anh
oanh tran » anh tran, anh tuan, binh tran
yang john » young john, king john, yang jin
john wong » john song, john bonn
hua chen » yu chen, a chen, hua ren
jui chen » yi chen
wong sau » wong sam, wong siu, wong shiu

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