Perhaps you should try some spelling variations:
wang liang » wang yang
wang oanh » wang yan, wang yang, dang anh
yang john » young john, king john, yang jun
tran hua » tan hua, tuan hua, tran duc
hua chen » jui chen, yu chen, a chen
yang jin » yang jie, yang jun, ying jin
wong sam » wong sau, wong lai, kong sar

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 liang)) tran hua 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 liang)) tran hua chen ((yang john) OR (yang jin)) wong sam ;.
• Adding a wildcard symbol may retrieve word variants: ((wang oanh) or (wang liang)) tran hua chen ((yang john) or (yang jin)) wong sam ;*.