Perhaps you should try some spelling variations:
among learning » long learning, making learning, using learning
patients 6.9 » patients 6.5, patients 7.9, patients 2.2
wang liang » wang yang
zhang ping » zhang ming, zhang jing, zhang ting
6.9 among » 19 among, 1.5 among, 1.8 among
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((wang liang) OR (zhang ping)) ((can lose) OR (can lost)) patients 6.9 among learning ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((wang liang) or (zhang ping)) ((can lose) or (can lost)) patients 6.9 among learning ;*.