Perhaps you should try some spelling variations:
yang yan » yang yang, wang yan, yang fan
yang yao » yang yang, wang yan, yang yi
hua gain » heat gain, run gain, hua ban
hong hai » shang hai, zhong tai, dang hai
yan hua » tan hua, ya hua, wang hua
yang li » yang lin, yang xi, yang yi
g yan » _ yan, g van, g yin

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 yan) OR (yang yao))g yan hua gain ((yang li) OR (yang di)) hong hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yang yan) OR (yang yao))g yan hua gain ((yang li) or (yang di)) hong hai ;~".
• Adding a wildcard symbol may retrieve word variants: ((yang yan) OR (yang yao))g yan hua gain ((yang li) or (yang di)) hong hai ;*.