Perhaps you should try some spelling variations:
ratings risk » patients risk
risk along » risk among, ask along
along when » along who, wrong when, talking when
hua yang » hui yang, huang yang, hua jiang
hua cost » a cost, run cost
eu cost » au costa, der cost, end cost
wang » wing, 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 OR wan) hua yang ((hua cost) or (eu cost)) ratings risk along when ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wang OR wan) hua yang ((hua cost) OR (eu cost)) ratings risk along when ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wang OR wan) hua yang ((hua cost) or (eu cost)) ratings risk along when ;*".