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

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 (au costa)) patients risk how slum ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yang ((jun cost) OR (au costa)) patients risk how slum ;.
• Adding a wildcard symbol may retrieve word variants: wang wang yang ((jun cost) or (au costa)) patients risk how slum ;*.