Perhaps you should try some spelling variations:
human gender » bhutan gender, german gender, human genome
human gene » human genome, human bone, human genetic
dong cao » dong xiao, dan cao, dong nan
yang jin » yang jie, yang jun, ying jin
jin long » jin song, pain long, jin ying
long shu » cong shu, tong shui, long du

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong cao) or (dong sin)) das ((human gene) OR (human gender)) yang jin long shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong cao) OR (dong sin)) das ((human gene) OR (human gender)) yang jin long shu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong cao) or (dong sin)) das ((human gene) OR (human gender)) yang jin long shu ;".
• Adding a wildcard symbol may retrieve word variants: ((dong cao) or (dong sin)) das ((human gene) OR (human gender)) yang jin long shu ;*.