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 close » can lose, can cause, can code
a close » a closer, a closed, _ close

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 close) OR (a close)) ratings risk among letters ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang yang ((can close) OR (a close)) ratings risk among letters ;*".