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
yang hong » yang hongli, quang hong, zhang hong
wang hong » wang yong, wang hyoung, wang lihong
hua gene » human gene, a gene, hua ren
dong » doing, long, done

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

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