Perhaps you should try some spelling variations:
china wang » china yang, china chang, china zhang
jiao yuan » xiao yuan, jiao yan, chiao yuan
can serve » can service, can survey, can save
gan jiao » gao jia, ben jiao, ren jiao
yang zhi » liang zhi, yang chik, yang zili
yan zhi » yan zi
van en » van den, van een, van es

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: gan jiao yuan ((van en) OR (can serve)) china wang ((((yang zhi) OR (wang zhi))) OR (yan zhi)) ;~.
• Adding a wildcard symbol may retrieve word variants: gan jiao yuan ((van en) or (can serve)) china wang ((((yang zhi) or (wang zhi))) or (yan zhi)) ;*.