Perhaps you should try some spelling variations:
gender codes » gender cops, gender class, gender index
wang yidan » wang yan
codes data » cases data, codes fatf, des data
wang dan » wang yan, wang ban, wang yang
3 gender » 2 gender
data der » data den, data under, data does
der saar » der saale

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: wang ((wang dan) OR (wang yidan)) 3 gender codes data der saar ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((wang dan) or (wang yidan)) 3 gender codes data der saar ;*.