Perhaps you should try some spelling variations:
credit trading » credit training, credit rating, credit standing
trading value » trading volume, trading volumes, creating value
value cong » value co, value closing, value change
doing von » ing von
wang yong » wang yang, wang hyoung, wang yan
doing un » doing und, doing our, doing _

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: ((((doing un) OR (doing von))) OR (wang yong)) a rural credit trading value cong shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((doing un) OR (doing von))) or (wang yong)) a rural credit trading value cong shu ;~".
• Adding a wildcard symbol may retrieve word variants: ((((doing un) OR (doing von))) or (wang yong)) a rural credit trading value cong shu ;*.