Perhaps you should try some spelling variations:
ryan john » brian john, tian john
yan tuan » yan guan, yan yuan, anh tuan
tuan hua » tan hua, tuan vu, yuan hui
yan john » gain john, tian john, von john
wong sam » wong sau, wong lai, kong sar
hua ren » hua chen
wang » wing, wan, lang

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 yan tuan hua ren ((yan john) OR (ryan john)) wong sam ;~.
• Adding a wildcard symbol may retrieve word variants: wang yan tuan hua ren ((yan john) or (ryan john)) wong sam ;*.