Perhaps you should try some spelling variations:
can service » can services, main service, un service
china wang » china yang, china chang, china zhang
chan wang » chen wang, chan kang, chan eng
gan guan » yan guan, quan guan, fan guon
guan jun » qian jun
yang zhi » wang zhi, liang zhi, yang chik
yan zhi » yan zi, wang zhi
van es » van nes, man es

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: gan guan jun ((van es) or (can service)) ((chan wang) OR (china wang)) ((yang zhi) or (yan zhi)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: gan guan jun ((van es) OR (can service)) ((chan wang) OR (china wang)) ((yang zhi) OR (yan zhi)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "gan guan jun ((van es) or (can service)) ((chan wang) OR (china wang)) ((yang zhi) or (yan zhi)) ;*".