Perhaps you should try some spelling variations:
training course » training courses
credit training » credit trading, credit rationing, credit rating
course cong » course can, course could, course cross
hua credit » dual credit, a credit, du credit
dong yang » dong hoang, wang yang, yang yang
dong sign » dong sin, among sign, dong bin

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong yang) or (dong sign)) ya hua credit training course cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((dong yang) OR (dong sign)) ya hua credit training course cong shu ;*.