Perhaps you should try some spelling variations:
training cost » training costs, training course, training courses
trading risk » trading case, trading room, funding risk
dual credit » rural credit, deals credit, equal credit
wang yang » wang yan, wang yanling
y dual » _ dual, a dual, 3 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: ((wang yang) OR (wang liang)) y dual credit ((trading risk) or (training cost)) cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (wang liang)) y dual credit ((trading risk) OR (training cost)) cong shu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yang) OR (wang liang)) y dual credit ((trading risk) or (training cost)) cong shu ;".
• Adding a wildcard symbol may retrieve word variants: ((wang yang) OR (wang liang)) y dual credit ((trading risk) or (training cost)) cong shu ;*.