Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
among breast » among east, facing breast, among forest
yang jui » yang judy, yang di, yang yi
can post » can cost, can lost, can postal
can past » can east, can fast, canal past
yang xi » yang di, yang yi

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

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