Perhaps you should try some spelling variations:
ying system » yang system, buying system, typing system
zhang ping » zhang ming, zhang jing, zhang ting
wei wang » wei yang, wen wang, wei shang
ping tan » wing tan, liang tan, ping wang
ying jin » yang jin, jing ji
yang jie » yang jin, yang di, yang jui
yang xi » yang di, yang jui
yang yi » yang di, 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: ((wei wang) OR (((yang xi) OR (yang yi)))) zhang ping tan ((ying jin) OR (yang jie)) ying system ;~.
• Adding a wildcard symbol may retrieve word variants: ((wei wang) or (((yang xi) or (yang yi)))) zhang ping tan ((ying jin) or (yang jie)) ying system ;*.