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 lose, can post, can boost
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 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 cost)) patients risk among who ;*".