Perhaps you should try some spelling variations:
training visit » training crisis, training asia, training vet
trading case » trading costs, trade case
hua credit » dual credit, a credit, du credit
yang yang » wang yang, wang yan
hong shu » cong shu, tong shui, wong shiu
yang ya » yang yao, yang yi, yang ka

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 ya hua credit ((trading case) or (training visit)) hong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: yang yang ya hua credit ((trading case) OR (training visit)) hong shu ;.
• Adding a wildcard symbol may retrieve word variants: yang yang ya hua credit ((trading case) or (training visit)) hong shu ;*.