Perhaps you should try some spelling variations:
training visit » training crisis, training asia, training vet
trading case » trading costs, trade case
wang yang » wang yan, wang liang, wang yanling
a credit » bad credit
yang ya » yang yao, yang yi, yang ka
hong yu » wong yue
ya a » a a, y a, ye a

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang ya a credit ((trading case) or (training visit)) hong yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang ya a credit ((trading case) OR (training visit)) hong yu ;*.