Perhaps you should try some spelling variations:
human gender » bhutan gender, german gender, human genome
human gene » human genome, human bone, human genetic
dong can » dong cao, dong nan, congo can
yang jin » yang jie, yang jun, ying jin
yang jui » yang judy, yang xi, yang yi
can how » clean how, plan how, can hong

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

• Performing a fuzzy search may retrieve terms with similar spellings: dong can how ((human gender) OR (human gene)) ((yang jin) or (((yang jui) or (yang di)))) hong w ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong can how ((human gender) OR (human gene)) ((yang jin) OR (((yang jui) OR (yang di)))) hong w ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong can how ((human gender) OR (human gene)) ((yang jin) or (((yang jui) or (yang di)))) hong w ;*".