Perhaps you should try some spelling variations:
rural credits » rural credit, total credits
defining risk » redefining risk
training cost » training costs, training course, training courses
why rural » pay rural, why oral, why real
skin why » asking why, atkin why, jin why
dof » dorf
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: dof skin why rural credits ((defining risk) or (training cost)) cong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dof skin why rural credits ((defining risk) OR (training cost)) cong shu ;.
• Adding a wildcard symbol may retrieve word variants: dof skin why rural credits ((defining risk) or (training cost)) cong shu ;*.