Perhaps you should try some spelling variations:
john ngosong » john song
wang oanh » wang yan, wang yang, dang anh
oanh tran » anh tran, anh tuan, binh tran
chen yang » chen rong
tran duc » tran dat, tran dai
ren yang » ren yan, dan yang, pei yang
sam » same, sham, syam

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