Perhaps you should try some spelling variations:
gender based » gender bias
human gender » bhutan gender, human gene, german gender
yang yang » wang yang, wang yan
des human » does human, das human, des humains
based jie » based job, based min, based ple
yang yao » wang yan, yang yi, yang fan
jie kang » jin kang, jie zhang, wie kann
kang ghi » hong ghi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((yang yao) OR (yang yang)) des human gender based jie kang ghi ;~.
• Adding a wildcard symbol may retrieve word variants: ((yang yao) or (yang yang)) des human gender based jie kang ghi ;*.