Perhaps you should try some spelling variations:
yang yang » wang yan
wang yang » wang yan, wang liang, wang yanling
gene song » gene one
song ming » song bing, song min, gong min
congo can » congo call, cong van, congo a
hua gene » human gene, a gene, hua ren
xi hua » xie hua, li hua

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

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