Perhaps you should try some spelling variations:
rising risks » growing risks, rising costs, taking risks
during risk » using risk, during crises, during crisis
yang using » yang jing, making using, change using
wang yang » wang yan, wang liang, wang yanling
using der » using dea, using dem, using older
der cost » oder cost, user cost, debt cost
how safe » how safety, how space, how scale
how she » how some, how shih

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 using der cost ((during risk) or (rising risks)) ((how she) OR (how safe)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang using der cost ((during risk) OR (rising risks)) ((how she) OR (how safe)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang using der cost ((during risk) or (rising risks)) ((how she) OR (how safe)) ;*".