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