Perhaps you should try some spelling variations:
bhutan gender » rhoton gender
human gender » human gene, german gender, human genome
huang ying » huang jing, huang ting, huang yang
wang yang » wang yan, wang liang, wang yanling
yang yang » wang yan
hong ghi » zhong zhi, hong g, hong hai
hai » hadi, haji, hari

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang yang ((human gender) OR (bhutan gender)) huang ying ((hong ghi) or (dang hai)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang yang ((human gender) OR (bhutan gender)) huang ying ((hong ghi) OR (dang hai)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang yang ((human gender) OR (bhutan gender)) huang ying ((hong ghi) or (dang hai)) ;*".