Perhaps you should try some spelling variations:
training risk » trading risk, training visit, training cost
equal credit » rural credit, total credit, local credit
dual credit » rural credit, rural credits, total credit
yang yang » wang yang, wang yan, wang yong
wong sau » kong sar
yang y » yang yi, yang d, yang y.c

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

• Performing a fuzzy search may retrieve terms with similar spellings: yang yang y ((dual credit) or (equal credit)) ((training risk) or (trading costs)) wong sau ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yang yang y ((dual credit) OR (equal credit)) ((training risk) OR (trading costs)) wong sau ;.
• Adding a wildcard symbol may retrieve word variants: yang yang y ((dual credit) or (equal credit)) ((training risk) or (trading costs)) wong sau ;*.