Perhaps you should try some spelling variations:
risk trading » risk taking, risk rating, right trading
trading risk » trading case, trading cost, sharing risk
wang yidan » wang yan
risk wong » risk among
done sin » dong sin, done using, dong bin
wong sau » kong sar
a risk » _ risk
ya a » a a, ka a

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((done sin) or (wang yidan)) ya a risk trading risk wong sau ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((done sin) OR (wang yidan)) ya a risk trading risk wong sau ;.
• Adding a wildcard symbol may retrieve word variants: ((done sin) or (wang yidan)) ya a risk trading risk wong sau ;*.