Perhaps you should try some spelling variations:
yan yuan » yan guan, fang yuan, nan yan
yuan hua » tuan hua, yuan hui, tan hua
hua gain » heat gain, run gain, hua ban
yang lin » wang lin, yang li, yang liang
yang jin » yang jun, ying jin, shang jin
yang jie » yang di, yang jui, yang xi
wai yan » wang yan, wei yang
hai » hadi, haji, hari

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wai yan yuan hua gain ((((wang yanling) or (yang lin))) or (((yang jin) or (yang jie)))) dang hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wai yan yuan hua gain ((((wang yanling) OR (yang lin))) OR (((yang jin) OR (yang jie)))) dang hai ;.
• Adding a wildcard symbol may retrieve word variants: wai yan yuan hua gain ((((wang yanling) or (yang lin))) or (((yang jin) or (yang jie)))) dang hai ;*.