Perhaps you should try some spelling variations:
yan yang » yang yang, yao yang, dan yang
yang hua » wang hua, yang hui, ying hua
hua gene » human gene, a gene, hua ren
gene yan » gene bank, ren yan, see yan
tin hong » tan hong, kia hong, thi hong
wang » wing, wan, lang
cong » congo, long, pong

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

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