Perhaps you should try some spelling variations:
ratings risk » patients risk
wrong when » wrong keen, wrong what, wrong why
wrong who » wrong why, wrong what, wrong way
hua yang » hui yang, huang yang, hua jiang
hua cost » a cost, run cost
eu cost » au costa, der cost, end cost
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang hua yang ((hua cost) or (eu cost)) ratings risk ((wrong when) OR (wrong who)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang hua yang ((hua cost) OR (eu cost)) ratings risk ((wrong when) OR (wrong who)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang hua yang ((hua cost) or (eu cost)) ratings risk ((wrong when) OR (wrong who)) ;*".