Perhaps you should try some spelling variations:
credit training » credit trading, credit rationing, credit rating
training case » training based, training cost, training can
wang yang » wang yan, wang liang, wang yanling
wang yong » wang hyoung, wang yan, wang shiyong
case cost » cases cost, case case, use cost
cost shu » host shut

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang yang) or (wang yong)) ya (ida or idea) credit training case cost shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (wang yong)) ya (ida OR idea) credit training case cost shu ;*.