Perhaps you should try some spelling variations:
risk china » risk chile, silk china
kyoung yun » young yun, kyoung yang, young eun
hyoung gun » young eun
long span » long han
china mid » china mit, china main, china made
dong di » dong sin
a a » a la
e a » et a

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: ((long span) OR (dong di)) ((a a) OR (e a)) risk china mid ((kyoung yun) OR (hyoung gun)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((long span) or (dong di)) ((a a) or (e a)) risk china mid ((kyoung yun) OR (hyoung gun)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((long span) or (dong di)) ((a a) or (e a)) risk china mid ((kyoung yun) OR (hyoung gun)) ;*.