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
wrong who » wrong what, wrong when, wrong way
wrong why » wrong way, strong why, wrong ways
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) OR (wrong why)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((huang chang) OR (liang ying)) der cost ratings risk ((wrong who) OR (wrong why)) ;.
• 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) OR (wrong why)) ;".
• Adding a wildcard symbol may retrieve word variants: wang ((huang chang) or (liang ying)) der cost ratings risk ((wrong who) OR (wrong why)) ;*.