Perhaps you should try some spelling variations:
ying system » yang system, buying system, typing system
zhang ping » zhang ming, zhang jing, zhang ting
ping wang » ping pong, hong wang
wang tang » wang yang, tang tang, wang liang
pei yang » wei yang, hui yang, pei yun
yang jui » yang judy, yang xi
yang yi » yang xi

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: ((pei yang) OR (((yang di) OR (((yang jui) OR (yang yi)))))) zhang ping wang tang li ying system ;~.
• Adding a wildcard symbol may retrieve word variants: ((pei yang) or (((yang di) or (((yang jui) or (yang yi)))))) zhang ping wang tang li ying system ;*.