Perhaps you should try some spelling variations:
yulu chen » yu chen
chen ping » chen rong, chen yang, chen wang
yang july » yang judy, yang jun
doing un » doing und, doing our, doing von
yang jui » yang judy, yang yi
un dann » und dann, um dann, bin dann
ping ji » ping jia, jing ji, ping yi
yang xi » 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: doing un dann yulu chen ping ji ((((yang xi) OR (yang di))) OR (((yang july) OR (yang jui)))) ;~.
• Adding a wildcard symbol may retrieve word variants: doing un dann yulu chen ping ji ((((yang xi) or (yang di))) or (((yang july) or (yang jui)))) ;*.