Perhaps you should try some spelling variations:
credit training » credit trading, credit rationing, credit rating
training case » training based, training cost, training can
hua credit » dual credit, a credit, du credit
wang yang » wang yan, wang liang, wang yanling
dong yang » dong hoang, yang yang, dan yang
case cong » case cost
dong nan » dong sin, dong bin, dong cao

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 yang) OR (wang yang)))) ya hua credit training case cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong nan) OR (((dong yang) OR (wang yang)))) ya hua credit training case cong shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong nan) or (((dong yang) OR (wang yang)))) ya hua credit training case cong shu ;*".