Perhaps you should try some spelling variations:
ying system » yang system, buying system, typing system
wang liang » wang yang
zhang wang » zhang fang, zhang zhang, zhang fan
wai yan » wang yan, wei yang
yang xi » yang yi, yang jui
ying li » ling li, yin li, ying jin
yang li » yang lin, yang yi, tang li

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 (((yang xi) OR (yang di)))) zhang wang liang ((ying li) OR (yang li)) ying system ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wai yan) or (((yang xi) or (yang di)))) zhang wang liang ((ying li) OR (yang li)) ying system ;~".
• Adding a wildcard symbol may retrieve word variants: ((wai yan) or (((yang xi) or (yang di)))) zhang wang liang ((ying li) OR (yang li)) ying system ;*.