Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
hanh trinh » hanh chinh
tranh thai » trang thai, tran thi, tinh thai
nghien di » nghiep di, nghiep dai, nghiem vi
thai dien » thai den, thau dien, thuat dien
dien hoc » dien hoa, khien hoc, tin hoc
tu canh » thu canh, tu chanh, tu can
di hoc » dai hoc, dia hoc, li hoc
thuc » thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuc hanh trinh nghien di hoc ) or ( tu canh tranh thai dien hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuc hanh trinh nghien di hoc ) OR ( tu canh tranh thai dien hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thuc hanh trinh nghien di hoc ) or ( tu canh tranh thai dien hoc ))*.