Perhaps you should try some spelling variations:
yang system » rating system, making system, buying system
zhang wing » zhang ming, zhang jing, zhang ping
yang jui » yang judy, yang di, yang yi
wing tan » wing ian, liang tan, hong tan
tan ying » fan ying, ran ying, tan yang
ying jin » yang jin, jing ji, yang jie
jin yang » jin ying, jin kang, yin yang
wai yan » wei yang
yang xi » yang di, 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: ((((wai yan) OR (wang yan))) OR (((yang xi) OR (yang jui)))) zhang wing tan ying jin yang system ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((wai yan) OR (wang yan))) or (((yang xi) or (yang jui)))) zhang wing tan ying jin yang system ;~".
• Adding a wildcard symbol may retrieve word variants: ((((wai yan) OR (wang yan))) or (((yang xi) or (yang jui)))) zhang wing tan ying jin yang system ;*.