Perhaps you should try some spelling variations:
training visit » training crisis, training asia, training vet
training work » training women, training workshop
dual credit » rural credit, deals credit, equal credit
dong nan » dong yang, dong sin, dong bin
ya dual » a dual, via dual
nan ya » nan yan, nana yaa

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 ya dual credit ((training work) or (training visit)) cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong nan ya dual credit ((training work) OR (training visit)) cong shu ;.
• Adding a wildcard symbol may retrieve word variants: dong nan ya dual credit ((training work) or (training visit)) cong shu ;*.