Perhaps you should try some spelling variations:
credit trading » credit training, credit rating, credit standing
trading value » trading volume, trading volumes, creating value
equal credit » dual credit, equity credit, rural credit
value cong » value co, value closing, value change
yang yang » wang yan
wang yang » wang yan, wang liang, wang yanling
a equal » _ equal, 6 equal, can equal
dong » doing, long, done

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: ((dong sin) OR (((yang yang) OR (wang yang)))) a equal credit trading value cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: ((dong sin) or (((yang yang) or (wang yang)))) a equal credit trading value cong shu ;*.