Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh dien
trinh thiet » trinh viet, trinh thi
hanh trinh » canh tranh, hanh chinh
nghien dan » nghiep dan, nghe dan, nghia dan
thiet dan » thuyet dan, thien dang, thien danh
du hanh » dieu hanh, duy khanh, luu hanh
dan hoc » van hoc, dan toc, dai hoc
tu hanh » lu hanh, thuc hanh, thi hanh

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

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