Perhaps you should try some spelling variations:
human gender » bhutan gender, human gene, german gender
human bones » human bone, human beings
long span » long han
yang jie » yang jin, yang di, yang jui
yang yi » yang di, yang jui
yang xi » yang di, yang jui
hong ng » hong kong, hong jong, hong hong
span 2 » span _, span 2.1

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

• Performing a fuzzy search may retrieve terms with similar spellings: long span 2 ((human gender) or (human bones)) ((yang jie) or (((yang yi) or (yang xi)))) hong ng ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: long span 2 ((human gender) OR (human bones)) ((yang jie) OR (((yang yi) OR (yang xi)))) hong ng ;.
• Adding a wildcard symbol may retrieve word variants: long span 2 ((human gender) or (human bones)) ((yang jie) or (((yang yi) or (yang xi)))) hong ng ;*.