Perhaps you should try some spelling variations:
training risk » trading risk, training visit, training work
training cost » training costs, training course, trading costs
equal credit » dual credit, rural credit, total credit
dong yang » dong hoang, wang yang, yang yang
y equal » _ equal
yang y » yang yi, yang d, yang y.c
cong » congo, long, hong

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: dong yang y equal credit ((training risk) OR (training cost)) cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: dong yang y equal credit ((training risk) or (training cost)) cong shu ;*.