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 yan, wang yong
wang yang » wang yan, wang liang, wang yanling
hong shu » hong seo, hong yu, hong ghi
y dual » _ dual, a dual

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) OR (wang yang)) y dual credit ((training risk) or (training cost)) hong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((yang yang) OR (wang yang)) y dual credit ((training risk) OR (training cost)) hong shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yang yang) OR (wang yang)) y dual credit ((training risk) or (training cost)) hong shu ;*".