Perhaps you should try some spelling variations:
yang liang » wang liang, yan liang, yang yang
sirene und » eigene und, sinne und
kong saur » kong sar, kong siu, kong your
yan xuan » yan guan, yan yuan, wang xuan
und john » und johann
wong siu » wong shiu, kong siu, wong sau
wang » wing, wan, lang

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 ((yan xuan) OR (yang liang)) vu sirene und john ((wong siu) OR (kong saur)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((yan xuan) or (yang liang)) vu sirene und john ((wong siu) or (kong saur)) ;*.