Perhaps you should try some spelling variations:
zhang yan » zhang fan, zhang jian, wang yan
guan rene » juan rene, glas rene
wong shiu » wong siu, cong shu, song shin
yun guan » yan guan, quan guan, gan guan
yang jie » yang jin, yang jui, yang yi
yan yun » yan yuan, yang yun, yan kun
yang xi » yang yi, yang jui
dong di » dong sin

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: zhang yan yun guan rene ((((yang jie) OR (yang xi))) OR (yang di)) ((wong shiu) OR (dong di)) ;~.
• Adding a wildcard symbol may retrieve word variants: zhang yan yun guan rene ((((yang jie) or (yang xi))) or (yang di)) ((wong shiu) or (dong di)) ;*.