Perhaps you should try some spelling variations:
cost ratings » cost savings, costs savings, bond ratings
ratings risk » patients risk
wrong what » wrong way, wrong when, wrong who
bring what » doing what, brief what, going what
wang wang » wang yang, wang liang, wang yan
wang gang » wang yang, wang liang, wang yan
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 gang der cost ratings risk ((wrong what) OR (bring what)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang wang gang der cost ratings risk ((wrong what) OR (bring what)) ;*.