Perhaps you should try some spelling variations:
training visit » training cost, training test
trading risk » trading case, trading cost, sharing risk
dual credit » rural credit, equal credit, rural credits
dong yang » dong hoang, wang yang, yang yang
yang jui » yang judy, yang di, yang xi
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 jui dual credit ((trading risk) or (training visit)) cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong yang jui dual credit ((trading risk) OR (training visit)) cong shu ;.
• Adding a wildcard symbol may retrieve word variants: dong yang jui dual credit ((trading risk) or (training visit)) cong shu ;*.