Perhaps you should try some spelling variations:
chen yang » chen rong
john wong » john song, john bonn
wang yao » wang yan, yang yao, gang yao
yao yang » yang yang
yang hua » wang hua, yang hui, ying hua
ren yang » ren yan, dan yang, pei yang
wong sau » wong sam, wong siu, wong shiu

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yao yang hua ((ren yang) or (chen yang)) john wong sau ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yao yang hua ((ren yang) OR (chen yang)) john wong sau ;.
• Adding a wildcard symbol may retrieve word variants: wang yao yang hua ((ren yang) or (chen yang)) john wong sau ;*.