Perhaps you should try some spelling variations:
human gender » bhutan gender, human gene, german gender
wang yong » wang yang, wang hyoung, wang yan
liang tan » liang dan, wing tan
liang sun » liang dan, wing sun
yong yan » yang yang, dong yang, ying yang
a gene » a genre, a gender, a gentle
sar » sara, star, saur

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yong yan ((a gene) or (human gender)) ((liang tan) OR (liang sun)) kong sar ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yong yan ((a gene) OR (human gender)) ((liang tan) OR (liang sun)) kong sar ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yong yan ((a gene) or (human gender)) ((liang tan) OR (liang sun)) kong sar ;".
• Adding a wildcard symbol may retrieve word variants: wang yong yan ((a gene) or (human gender)) ((liang tan) OR (liang sun)) kong sar ;*.