Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
wang yang » wang yan, wang liang, wang yanling
among who » along who, among hr, wrong who
yang yan » yang yang, wang yan, yang fan
can lost » can post, can boost, can close
can lose » can close, can losers, can't lose
can cost » can costa, can post, chain cost

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

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