Perhaps you should try some spelling variations:
close patients » care patients, les patients, cleft patients
patients ngi » patients si, patients unfit, patients near
among peers » among ers, among users, among letters
huang yang » huang ying, huang chang, yang yang
liang sun » liang dan, liang tan, wing sun
wang yang » wang yan, wang liang, wang yanling
can close » can lose, a close, can cause

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

• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((((liang sun) OR (huang yang))) OR (wang yang)) can close patients ngi among peers ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((((liang sun) or (huang yang))) or (wang yang)) can close patients ngi among peers ;*.