Perhaps you should try some spelling variations:
among letters » among lecturers, among learners, among masters
ratings risk » patients risk
wang liang » wang yang
liang yang » liang ying, wang yang, yang yang
can losers » can lose, can lower
can cost » can costa, can lost, 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 yang ((can losers) or (can cost)) ratings risk among letters ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang yang ((can losers) OR (can cost)) ratings risk among letters ;*.