Perhaps you should try some spelling variations:
tian john » brian john, ethan john, tuman john
wang anh » dang anh, wang yang, wang yan
anh tuan » anh tran, dinh tuan, oanh tran
tuan hua » tan hua, tuan vu, yuan hui
hua chen » jui chen, yu chen, a chen
yan john » ryan john, gain john, von john
song sam » wong sam, kong sar, song pae

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: wang anh tuan hua chen ((yan john) OR (tian john)) song sam ;~.
• Adding a wildcard symbol may retrieve word variants: wang anh tuan hua chen ((yan john) or (tian john)) song sam ;*.