Perhaps you should try some spelling variations:
yang david » wang david, young david, long david
deng david » deming david, leung david, seong david
west china » east china, what china, let china
china jing » china jiing, china ying, china going
dong sein » dong bin, dong wei, ong sean
yang yao » yang yang, wang yan, yang yi

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: yang yao ((yang david) OR (deng david)) west china jing ((dong sin) OR (dong sein)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yao ((yang david) OR (deng david)) west china jing ((dong sin) or (dong sein)) ;~".
• Adding a wildcard symbol may retrieve word variants: yang yao ((yang david) OR (deng david)) west china jing ((dong sin) or (dong sein)) ;*.