Perhaps you should try some spelling variations:
john song » john wong, john bonn, john ngosong
gene yang » gene bank
wing yan » wang yan, wing ian, wing tan
yan yang » yang yang, yao yang, dan yang
yang hua » wang hua, yang hui, ying hua
hua gene » human gene, a gene, hua ren
jin song » jie song, kim song, jin ying

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: wing yan yang hua gene yang ((jin song) OR (john song)) (sar OR star) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wing yan yang hua gene yang ((jin song) OR (john song)) (sar or star) ;~".
• Adding a wildcard symbol may retrieve word variants: wing yan yang hua gene yang ((jin song) OR (john song)) (sar or star) ;*.