Perhaps you should try some spelling variations:
patients risk » patients links, patients si, patients view
patient risk » patient task, patient cost, orient risk
among breast » among east, facing breast, among forest
wang liang » wang yang
liang dan » liang tan, king dan, liang sun
can lost » can cost, can lose, can post

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

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