Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
gene yang » gene bank
dong cao » dong xiao, dan cao, dong nan
dong di » dong sin
li cong » li rong, jiu cong
li song » li rong, kim song, jie song
a gene » a genre, a gender, a gentle
ye a » yet a, e a, me 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 di) or (dong cao))) or (yang yang)) ye a gene yang ((li cong) or (li song)) shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((dong di) OR (dong cao))) OR (yang yang)) ye a gene yang ((li cong) OR (li song)) shu ;.
• Adding a wildcard symbol may retrieve word variants: ((((dong di) or (dong cao))) or (yang yang)) ye a gene yang ((li cong) or (li song)) shu ;*.