Perhaps you should try some spelling variations:
guifang yang » cuifen yang, huang yang
yang yang » wang yang, wang yan
gene wang » gene bank, wen wang
hua gene » human gene, a gene, hua ren
wang tao » wang qiao, huang tao, wang yan
tao hong » tan hong, dao huong, gao zhong
hong yu » wong yue

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

• Performing a fuzzy search may retrieve terms with similar spellings: doing ((guifang yang) or (yang yang)) hua gene wang tao hong yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doing ((guifang yang) OR (yang yang)) hua gene wang tao hong yu ;*.