Perhaps you should try some spelling variations:
human gene » human genome, human gender, human bone
yang yang » wang yang, wang yan
dong sind » dong sin, dong bin, dong ping
yang fan » zhang fan, yang dean, yang jin
fan ying » fan xing, ran ying, tan ying
ying hua » ming hua, wang hua, ying zhu
hua ren » hua chen
a gene » a genre, a gender, a gentle

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 yang) OR (dong sind)) ya ((((a gene) OR (human gene))) OR (hua ren)) yang fan ying hua ;~.
• Adding a wildcard symbol may retrieve word variants: ((yang yang) or (dong sind)) ya ((((a gene) or (human gene))) or (hua ren)) yang fan ying hua ;*.