Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
hua gene » human gene, a gene, hua ren
gene yan » gene bank, ren yan, see yan
jiu kong » jiu cong, liu kung, liu yong
yan yan » yan yuan, nan yan, wang yan
yan jiu » yang jie, yang jin, pang jiu
sar » sara, star, saur

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: wing ((yan yan) OR (yang yang)) hua gene yan jiu kong sar ;~.
• Adding a wildcard symbol may retrieve word variants: wing ((yan yan) or (yang yang)) hua gene yan jiu kong sar ;*.