Perhaps you should try some spelling variations:
dong yang » dong hoang, yang yang, dan yang
wang yang » wang yan, wang liang, wang yanling
dong cao » dong xiao, dan cao, dong nan
yong cai » yong c, yong wah
hua gene » human gene, a gene, hua ren
gene yan » gene bank, ren yan, see yan
jiu cong » li cong
yan jiu » yang jie, yang jin, pang jiu

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

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