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