Perhaps you should try some spelling variations:
credit rationing » credit rating, credit ratings
credit training » credit trading, credit rating, credit granting
yang yang » wang yang, wang yan
case how » curse how, case h, else how
how yu » how you, how your
a du » a d, a de, a u
dong » doing, long, done

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong sin) or (yang yang)) a du ((credit training) OR (credit rationing)) case how yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong sin) OR (yang yang)) a du ((credit training) OR (credit rationing)) case how yu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong sin) or (yang yang)) a du ((credit training) OR (credit rationing)) case how yu ;*".