Perhaps you should try some spelling variations:
yang yaong » yang yang, wang yang, wang yong
yaong does » young does
does human » des human, das human, does humanity
human gene » human genome, human gender, human bone
gene yang » gene bank
jin song » jie song, john song, kim song
jin kang » jin chang, jin kyung, jing fang

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 yaong does human gene yang ((jin song) OR (jin kang)) ghi ;~.
• Adding a wildcard symbol may retrieve word variants: yang yaong does human gene yang ((jin song) or (jin kang)) ghi ;*.