Perhaps you should try some spelling variations:
among lecturers » among letters
des patients » des patents, les patients, des patienten
patients per » patients en, patients _, patients 1
xiang zhang » xiliang zhang, xiabo zhang, xiao zhang
xiang zhong » xiliang zhang
per among » power among, era among, erm among
fan des » fan de, plan des

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 ((xiang zhang) OR (xiang zhong)) fan des patients per among lecturers ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((xiang zhang) or (xiang zhong)) fan des patients per among lecturers ;*.