Perhaps you should try some spelling variations:
ratings risk » patients risk
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
jun cost » run cost, can cost
au costa » can costa, _ costa, da costa
how slum » how slow, how sub, how sun
eu cost » der cost, end cost, eu court

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang wang yang ((jun cost) or (((eu cost) OR (au costa)))) ratings risk how slum ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yang ((jun cost) OR (((eu cost) OR (au costa)))) ratings risk how slum ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang wang yang ((jun cost) or (((eu cost) OR (au costa)))) ratings risk how slum ;".
• Adding a wildcard symbol may retrieve word variants: wang wang yang ((jun cost) or (((eu cost) OR (au costa)))) ratings risk how slum ;*.