Perhaps you should try some spelling variations:
training course » training courses
rural credits » rural credit, total credits
training vet » training von, training ictvet, training comet
wang yang » wang yan, wang liang, wang yanling
jui rural » ii rural
yang jui » yang judy, yang di, yang xi

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: wang yang jui rural credits ((training vet) OR (training course)) cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang jui rural credits ((training vet) or (training course)) cong shu ;*.