Perhaps you should try some spelling variations:
ying system » yang system, buying system, typing system
zhang ping » zhang ming, zhang jing, zhang ting
wei yang » pei yang, wei wang, wei yang's
ping tan » wing tan, liang tan, ping wang
tan yang » dan yang, tan ying, tan yong
yang xi » yang jui
yang yi » yang jui
yi ying » li ying, yi jing, yi ning

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: ((wei yang) OR (((yang di) OR (yang xi)))) zhang ping tan yang yi ying system ;~.
• Adding a wildcard symbol may retrieve word variants: ((wei yang) or (((yang di) or (yang xi)))) zhang ping tan yang yi ying system ;*.