Perhaps you should try some spelling variations:
world trading » world trade
trading risk » trading case, trading cost, sharing risk
risk coping » risk pooling
dong yang » dong hoang, wang yang, yang yang
hua world » a world, our world, up world
dong nan » dong sin, dong bin, dong cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((dong nan) OR (dong yang)) ya hua world trading risk coping shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((dong nan) OR (dong yang)) ya hua world trading risk coping shu ;".
• Adding a wildcard symbol may retrieve word variants: ((dong nan) OR (dong yang)) ya hua world trading risk coping shu ;*.