Perhaps you should try some spelling variations:
credit trading » credit training, credit rating, credit standing
trading cost » trading costs, training cost, trading case
dual credit » rural credit, deals credit, equal credit
yang yang » wang yang, wang yan
dong nan » dong yang, dong bin, dong cao
ya dual » a dual, via dual
cong » congo, long, hong

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((dong nan) OR (dong sin))) or (yang yang)) ya dual credit trading cost cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((dong nan) OR (dong sin))) OR (yang yang)) ya dual credit trading cost cong shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((dong nan) OR (dong sin))) or (yang yang)) ya dual credit trading cost cong shu ;*".