Perhaps you should try some spelling variations:
credit training » credit trading, credit rationing, credit rating
equal credit » dual credit, equity credit, rural credit
value cong » value closing, value change
yang yang » wang yang, wang yan
value co » value _, value a
a equal » _ equal, 6 equal, can equal

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 OR doing) sin) OR (yang yang)) a equal credit training ((value cong) OR (value co)) shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((dong or doing) sin) or (yang yang)) a equal credit training ((value cong) OR (value co)) shu ;~".
• Adding a wildcard symbol may retrieve word variants: (((dong or doing) sin) or (yang yang)) a equal credit training ((value cong) OR (value co)) shu ;*.