Perhaps you should try some spelling variations:
gene yang » gene bank
yang yang » wang yang, wang yan
dong nan » dong yang, dong sin, dong bin
dong cao » dong xiao, dan cao, yong cai
yang li » yang lin, yang di, yang xi
li cong » li rong, li song, jiu cong
ya a » y a, ye a, yu a
a a » a la

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)) ((ya a) OR (a a)) gene yang li cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((dong nan) OR (dong cao))) OR (yang yang)) ((ya a) OR (a a)) gene yang li cong shu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((dong nan) or (dong cao))) or (yang yang)) ((ya a) OR (a a)) gene yang li cong shu ;".
• Adding a wildcard symbol may retrieve word variants: ((((dong nan) or (dong cao))) or (yang yang)) ((ya a) OR (a a)) gene yang li cong shu ;*.