Perhaps you should try some spelling variations:
ratings risk » patients risk
savings rate » savings rates
wrong what » wrong way, bring what, wrong when
oder cost » der cost, lower cost, power cost
yan kann » man kann, yuan kang, yan wang
yan kun » yan guan, yan yuan
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 ((yan kann) OR (yan kun)) oder cost ((ratings risk) or (savings rate)) wrong what ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yan kann) OR (yan kun)) oder cost ((ratings risk) OR (savings rate)) wrong what ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yan kann) OR (yan kun)) oder cost ((ratings risk) or (savings rate)) wrong what ;*".