Perhaps you should try some spelling variations:
lead patients » les patients, cleft patients, des patients
patients risk » patient risk, patients links, patients si
among peers » among ers, among users, among letters
liang yang » liang ying, yang yang, huang yang
wang yang » wang yan, wang liang, wang yanling
dean lead » can lead, demands lead

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 (wang yang)) dean lead patients risk among peers ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((liang yang) OR (wang yang)) dean lead patients risk among peers ;*".