Perhaps you should try some spelling variations:
truong nghien » trong nghien, duong nghien, tron nghien
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
canh truong » anh truong, manh truong, chinh truong
sanh trinh » hanh trinh, anh trinh, sinh trinh
nghien d » nghiem d, nghien o, nghiem de
tu canh » thu canh, tu chanh, tu can
so sanh » do sanh
de hoc » te hoc, dien hoc
du hoc » tu hoc, duoc hoc
d hoc » ad hoc, y hoc, _ hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu canh truong nghien ((de hoc) or (du hoc)) ) or ( so sanh trinh nghien d hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu canh truong nghien ((de hoc) OR (du hoc)) ) OR ( so sanh trinh nghien d hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu canh truong nghien ((de hoc) or (du hoc)) ) or ( so sanh trinh nghien d hoc ))*.