Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
hanh trinh » canh tranh, hanh chinh
hanh trang » thanh trung, canh tranh, minh trang
nghien li » nguyen li, nghiem vi, nghiep ly
thi dich » tri dich, tnhh dich, khai dich
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 trang ((thi dich) OR (thi bich)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuc hanh trinh nghien li hoc ) OR ( tu hanh trang ((thi dich) OR (thi bich)) hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thuc hanh trinh nghien li hoc ) or ( tu hanh trang ((thi dich) OR (thi bich)) hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( thuc hanh trinh nghien li hoc ) or ( tu hanh trang ((thi dich) OR (thi bich)) hoc ))*.