Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
guang yan » huang yang, wang yan, zhang yan
zhong zhi » zhang zhi, hong ghi, zhong tai
hua gain » heat gain, run gain, hua ban
yan hua » tan hua, ya hua, wang hua
yang yi » yang jui
yang xi » 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: yang guang yan hua gain ((yang yi) OR (((yang xi) OR (yang di)))) zhong zhi ;~.
• Adding a wildcard symbol may retrieve word variants: yang guang yan hua gain ((yang yi) or (((yang xi) or (yang di)))) zhong zhi ;*.