Perhaps you should try some spelling variations:
wang yang » wang yan, wang liang, wang yanling
yang yang » wang yan
gene bank » gene banks, one bank, genomen bank
bank ning » bank doing, bank lending, bank funding
zhong zhi » zhang zhi, hong ghi, zhong tai
dang hadi » dang hai
yang hua » wang hua, yang hui, ying hua
hua gene » human gene, a gene, hua ren

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: wang yang yang hua gene bank ning ((zhong zhi) OR (dang hadi)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang yang hua gene bank ning ((zhong zhi) or (dang hadi)) ;*.