Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
gene bank » gene banks, one bank, genomen bank
dong nan » dong yang, dong sin, dong bin
dong cao » dong xiao, dan cao, yong cai
li cong » li rong, li song
a gene » a genre, a gender, a gentle
yet a » et a, yet _, get a

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((dong nan) or (dong cao))) or (yang yang)) yet a gene bank ((li cong) or (jiu cong)) shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((dong nan) OR (dong cao))) OR (yang yang)) yet a gene bank ((li cong) OR (jiu cong)) shu ;.
• Adding a wildcard symbol may retrieve word variants: ((((dong nan) or (dong cao))) or (yang yang)) yet a gene bank ((li cong) or (jiu cong)) shu ;*.