Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
wang yong » wang yang, wang hyoung, wang yan
gene yang » gene bank
hua gene » human gene, a gene, hua ren
yang tin » yang jin, yang lin, yang jing
tin hong » tan hong, kia hong, thi hong
hong hai » shang hai, zhong tai, dang hai
ka hua » ya hua, ka chuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((yang yang) or (wang yong)) ka hua gene yang tin hong hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((yang yang) OR (wang yong)) ka hua gene yang tin hong hai ;.
• Adding a wildcard symbol may retrieve word variants: ((yang yang) or (wang yong)) ka hua gene yang tin hong hai ;*.