Perhaps you should try some spelling variations:
cost ratings » cost savings, costs savings, bond ratings
risk wrong » risk among
risk along » risk among, ask along
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
yang der » gang der, yang dean, klang der
der cost » oder cost, user cost, debt cost

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "wang wang yang der cost ratings ((risk wrong) OR (risk along)) what ;~".
• Adding a wildcard symbol may retrieve word variants: wang wang yang der cost ratings ((risk wrong) OR (risk along)) what ;*.