Perhaps you should try some spelling variations:
gender case » gender caste, gender based, gender class
gender das » gender bias, gender data, gender a
wang yang » wang yan, wang liang, wang yanling
plan some » explain some
yang yan » yang yang, wang yan, yang fan
can some » can solve, can women, can save
yan a » can a, yan _, jan a

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 yan a ((gender das) or (gender case)) ((can some) or (plan some)) small ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang yan a ((gender das) OR (gender case)) ((can some) OR (plan some)) small ;.
• Adding a wildcard symbol may retrieve word variants: wang yang yan a ((gender das) or (gender case)) ((can some) or (plan some)) small ;*.