Perhaps you should try some spelling variations:
ratings risk » patients risk
lost ratings » load ratings, lost earnings, bond ratings
among users » among ers, among peers, among masters
liang ying » liang liying, huang ying, zhang ying
wang yang » wang yan, wang liang
can lost » can cost, can lose, can post

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((((wang yang) OR (wang yanling))) or (liang ying)) can lost ratings risk among users ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((((wang yang) OR (wang yanling))) OR (liang ying)) can lost ratings risk among users ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((((wang yang) OR (wang yanling))) or (liang ying)) can lost ratings risk among users ;*".