Perhaps you should try some spelling variations:
yang yaong » yang yang, wang yang, wang yong
gene yang » gene bank
yaong ya » yang yao
hua gene » human gene, a gene, hua ren
yang tin » yang jin, yang lin, yang jing
hong ghi » zhong zhi, hong g
hong hai » shang hai, zhong tai, dang hai

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

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