Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
cost patients » cost patient, cleft patients, care patients
liang yang » wang yang, yang yang, huang yang
liang ying » liang liying, huang ying, zhang ying
risk along » risk among, ask along
can cost » can costa, can lost, can post
nhue » neue

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 yang) or (liang ying)) can cost patients risk along nhue ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((liang yang) OR (liang ying)) can cost patients risk along nhue ;.
• Adding a wildcard symbol may retrieve word variants: wang ((liang yang) or (liang ying)) can cost patients risk along nhue ;*.