Perhaps you should try some spelling variations:
china zhang » china chang, cheng zhang, chin chang
zhang hong » zhang rong, change hong, zhang zhang
yang yang » wang yang
wong sam » wong sau, wong lai, kong sar
wong siu » wong shiu, kong siu, wong sau
yang yi » yang xi, yang jui
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) or (yang yang)) ((yang yi) or (yang di)) china zhang hong ((wong sam) or (wong siu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yan) OR (yang yang)) ((yang yi) OR (yang di)) china zhang hong ((wong sam) OR (wong siu)) ;.
• Adding a wildcard symbol may retrieve word variants: ((wang yan) or (yang yang)) ((yang yi) or (yang di)) china zhang hong ((wong sam) or (wong siu)) ;*.