Perhaps you should try some spelling variations:
training visit » training crisis, training asia, training vet
trading case » trading costs, trade case
dong hoang » hong hong
hua credit » dual credit, a credit, du credit
hoang ya » hoang vu, hoang sy, hoang _
hong shu » cong shu, tong shui, wong shiu

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

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