Perhaps you should try some spelling variations:
ratings risk » patients risk
wang liang » wang yang
liang yang » liang ying, wang yang, yang yang
can costa » can cost, can postal, da costa
among ers » among peers, among users, among east
can lose » can close, can losers, can't lose
can lost » can cost, can post, can boost

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