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
song hai » hong hai, shang hai, dang hai
di song » li song, kim song, jie song
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 di song hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((yang yang) OR (wang yong)) ka hua gene yang di song hai ;.
• Adding a wildcard symbol may retrieve word variants: ((yang yang) or (wang yong)) ka hua gene yang di song hai ;*.