Perhaps you should try some spelling variations:
patients links » patients clients, patients final, patients risk
ratings risk » patients risk
wang zhang » wang zheng, wang luhang, zhang zhang
zhang ying » zhang ming, zhang jing, zhang ping
ying diet » ring die
diet cost » die cost, direct cost, net cost
among men » among women

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 zhang ying diet cost ((ratings risk) OR (patients links)) among men ;~.
• Adding a wildcard symbol may retrieve word variants: wang zhang ying diet cost ((ratings risk) or (patients links)) among men ;*.