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 siu » wong shiu, kong siu, wong sau
yang yi » yang di, yang jui
yang xi » yang di, yang jui
ong sar » kong sar, ong sean, wong sam
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) OR (yang yang)) ((yang yi) OR (yang xi)) china zhang hong ((ong sar) OR (wong siu)) ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang yan) or (yang yang)) ((yang yi) or (yang xi)) china zhang hong ((ong sar) or (wong siu)) ;*.