Perhaps you should try some spelling variations:
patients risk » patient risk, patients links, patients si
patient cost » patient care
liang zhang » xiliang zhang, xiang zhong, zhang zhang
among users » among ers, among peers, among masters
wang liang » wang yang
fan lose » can lose, can close, can lost

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 zhang fan lose ((patients risk) or (patient cost)) among users ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang liang zhang fan lose ((patients risk) OR (patient cost)) among users ;*.