Perhaps you should try some spelling variations:
ratings risk » patients risk
cost ratings » cost savings, costs savings, bond ratings
huang chang » huang cheng, hoong chang, huang yang
liang ying » liang liying, huang ying, zhang ying
risk wrong » risk among, risk along
wrong who » wrong why, wrong what, wrong when
der cost » oder cost, user cost, debt 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 ((huang chang) OR (liang ying)) der cost ratings risk wrong who ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((huang chang) OR (liang ying)) der cost ratings risk wrong who ;".
• Adding a wildcard symbol may retrieve word variants: wang ((huang chang) OR (liang ying)) der cost ratings risk wrong who ;*.