Perhaps you should try some spelling variations:
ratings risk » patients risk
lost ratings » load ratings, lost earnings, bond ratings
among breast » facing breast, among forest
among east » among ers, among health
liang dan » king dan, liang sun, wang dan
liang tan » liang sun, wing tan
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 ((liang dan) OR (liang tan)) can lost ratings risk ((among east) or (among breast)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((liang dan) OR (liang tan)) can lost ratings risk ((among east) OR (among breast)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((liang dan) OR (liang tan)) can lost ratings risk ((among east) or (among breast)) ;*".