Perhaps you should try some spelling variations:
ratings risk » patients risk
among peers » among ers, among users, among letters
liang yang » liang ying, wang yang, huang yang
yang yang » wang yang, wang yan
can close » a close, can cause, can code
can lose » can lost, can losers, can't lose

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 (yang yang)) ((can lose) OR (can close)) ratings risk among peers ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((liang yang) OR (yang yang)) ((can lose) OR (can close)) ratings risk among peers ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((liang yang) or (yang yang)) ((can lose) OR (can close)) ratings risk among peers ;*".