Perhaps you should try some spelling variations:
china chung » china chang, china china, china chen
chung chuan » chen chuan
yan ghana » yan guan
yan zhang » yuan chang, bin zhang, han chang
zhong tai » hong hai, zhong zhi
chuan fa » chuan kao, chan fai
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 ghana) OR (yan zhang)) china chung chuan fa ((zhong tai) OR (hong tan)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wai ((yan ghana) OR (yan zhang)) china chung chuan fa ((zhong tai) or (hong tan)) ;~".
• Adding a wildcard symbol may retrieve word variants: wai ((yan ghana) OR (yan zhang)) china chung chuan fa ((zhong tai) or (hong tan)) ;*.