Perhaps you should try some spelling variations:
china chung » china chang, china chen, china changqi
chuan hua » chuang hui, chuan fa, chun hui
zhong tai » hong hai, zhong zhi
yan guan » gan guan, yan yuan, yang guang
wai yan » wang yan, wei yang
zhong » zlong
hong » long
tan » than

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: wai yan guan ((china chung) OR (china china)) chuan hua ((zhong tai) OR (hong tan)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wai yan guan ((china chung) OR (china china)) chuan hua ((zhong tai) or (hong tan)) ;~".
• Adding a wildcard symbol may retrieve word variants: wai yan guan ((china chung) OR (china china)) chuan hua ((zhong tai) or (hong tan)) ;*.