Perhaps you should try some spelling variations:
yulu chen » yu chen
chen ping » chen rong, chen yang, chen wang
yang july » yang judy, yang jui
sein das » sein des, sein de, sein du
yang jun » yang jui, pang jun, yang jin
ping ji » ping jia, jing ji, ping yi
yang xi » yang yi, yang jui

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 sein das yulu chen ping ji ((((yang xi) OR (yang di))) OR (((yang july) OR (yang jun)))) ;~.
• Adding a wildcard symbol may retrieve word variants: doing sein das yulu chen ping ji ((((yang xi) or (yang di))) or (((yang july) or (yang jun)))) ;*.