Perhaps you should try some spelling variations:
von sprach » von sprache, von sprachen
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
yang yu » yang yue, yang yun, sang yu
yu chen » yu cheng, yi chen, yulu chen
yang yi » yang xi, yang jui
sar » sara, star, saur

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 wang yang yu chen ((yang yi) OR (yang di)) ((von sprach) OR (kong sar)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang wang yang yu chen ((yang yi) or (yang di)) ((von sprach) or (kong sar)) ;*.