Perhaps you should try some spelling variations:
training risk » trading risk, training visit, training work
training cost » training costs, training course, trading costs
dual credit » rural credit, equal credit, rural credits
yang yang » wang yang, wang yan, wang yong
yang a » yang ka, fang a, yang d
a dual » _ dual
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: yang yang a dual credit ((training risk) OR (training cost)) cong shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "yang yang a dual credit ((training risk) OR (training cost)) cong shu ;".
• Adding a wildcard symbol may retrieve word variants: yang yang a dual credit ((training risk) OR (training cost)) cong shu ;*.