Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
gene bank » gene banks, one bank, genomen bank
bank duc » bank dco, bank die, bank do
yang yi » yang di, yang xi, yang jui
yang ka » yang fan, yang yao
a gene » a genre, a gender, a gentle
dang » dan, lang, wang
hai » hadi, haji, hari

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: dong ((yang yi) OR (((yang ka) OR (yang yang)))) a gene bank duc dang hai ;~.
• Adding a wildcard symbol may retrieve word variants: dong ((yang yi) or (((yang ka) or (yang yang)))) a gene bank duc dang hai ;*.