Perhaps you should try some spelling variations:
change dealing » change leading, change modelling, change learning
gender change » gender age
yang guang » yang yang, yan guan, yang liang
wang yang » wang yan, wang liang, wang yanling
date sub » data sub, case sub, note sub
die spur » der spur
guang 2 » guang eu, zugang 2

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 yang guang 2 gender change dealing ((date sub) OR (die spur)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang guang 2 gender change dealing ((date sub) or (die spur)) ;*.