Perhaps you should try some spelling variations:
training visit » training cost, training test
training risk » trading risk, training cost, training work
dual credit » rural credit, equal credit, rural credits
dong nan » dong yang, dong sin, dong bin
ya dual » a dual
nan ya » nana yaa
cong » congo, long, hong

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