Perhaps you should try some spelling variations:
during risk » using risk, during crises, during crisis
liang yang » liang ying, wang yang, huang yang
yang yang » wang yang, wang yan
duty cost » duty case
risk hong » risk among, risk along, risk how
hong shu » cong shu, tong shui, wong shiu
du cost » du cout, eu cost, 3dp cost

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((liang yang) OR (yang yang)) ((du cost) or (duty cost)) during risk hong shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((liang yang) OR (yang yang)) ((du cost) OR (duty cost)) during risk hong shu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((liang yang) OR (yang yang)) ((du cost) or (duty cost)) during risk hong shu ;".
• Adding a wildcard symbol may retrieve word variants: wang ((liang yang) OR (yang yang)) ((du cost) or (duty cost)) during risk hong shu ;*.