Perhaps you should try some spelling variations:
wang wang » wang yang, wang liang, wang yan
john song » john wong, john bonn, john ngosong
wang tan » wang yan, wang ban, wang dan
hua gene » human gene, a gene, hua ren
jin song » jie song, jin ying, ein sog
kim song » kim young, kim eung
tan hua » tuan hua, wang hua, tan chia

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang wang tan hua gene sheng ((((jin song) or (kim song))) or (john song)) shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang tan hua gene sheng ((((jin song) OR (kim song))) OR (john song)) shu ;.
• Adding a wildcard symbol may retrieve word variants: wang wang tan hua gene sheng ((((jin song) or (kim song))) or (john song)) shu ;*.