Perhaps you should try some spelling variations:
change dealing » change leading, change modelling, change learning
gender change » gender age
yan yuan » yan guan, fang yuan, yan clan
z gender » 2 gender, 3 gender, 1 gender
date sub » data sub, case sub, note sub
nan yan » nan ya, wang yan, qian yan
spur » sur

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: (wan OR lang) ((yan yuan) OR (nan yan)) z gender change dealing ((date sub) OR (der spur)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wan or lang) ((yan yuan) OR (nan yan)) z gender change dealing ((date sub) or (der spur)) ;~".
• Adding a wildcard symbol may retrieve word variants: (wan or lang) ((yan yuan) OR (nan yan)) z gender change dealing ((date sub) or (der spur)) ;*.