Perhaps you should try some spelling variations:
cheng zhang » cheng han, zhen zhang, chen zheng
zhang ming » zhang xin
yan yuan » yan guan, fang yuan, nan yan
yi cheng » yi chen, yu cheng, xi cheng
wong sau » wong siu, wong shiu, wong lai
wong sam » wong lai, kong sar, von sam
yuan yi » yuan li, yuan zi, yuan fei
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yan yuan yi cheng zhang ming ((wong sau) or (wong sam)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan yuan yi cheng zhang ming ((wong sau) OR (wong sam)) ;*.