Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
hanh trinh » canh tranh, hanh chinh
nghien li » nguyen li, nghiem vi, nghiep ly
hanh tran » hanh trang, thanh tran, hanh tram
thi dich » thi bich, tri dich, tnhh dich
dich hoc » sinh hoc, hinh hoc, tinh hoc
tu hanh » du hanh, lu hanh, thi hanh
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 li hoc ) or ( tu hanh tran thi dich hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuc hanh trinh nghien li hoc ) OR ( tu hanh tran thi dich hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thuc hanh trinh nghien li hoc ) or ( tu hanh tran thi dich hoc ))*.