Perhaps you should try some spelling variations:
human gender » bhutan gender, human gene, german gender
hua gene » human gene, a gene, hua ren
yang jin » yang jie, yang jun, shang jin
ying jin » jing ji, yang jie
hong hai » shang hai, zhong tai, dang hai
yan xi » yang xi, yan zi
wang » wing, wan, lang

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

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