Perhaps you should try some spelling variations:
human gender » bhutan gender, german gender, human genome
human gene » human genome, human bone, human genetic
ying hong » ying chang, hong hong, tin hong
yan yan » yan yuan, nan yan, yang yang
wang » wing, lang
kong » long, pong, ong
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 or wan) yan yan ((human gene) OR (human gender)) ying hong kong sar ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wang OR wan) yan yan ((human gene) OR (human gender)) ying hong kong sar ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wang or wan) yan yan ((human gene) OR (human gender)) ying hong kong sar ;".
• Adding a wildcard symbol may retrieve word variants: (wang or wan) yan yan ((human gene) OR (human gender)) ying hong kong sar ;*.