Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
canh trinh » canh tranh, canh tinh, anh trinh
trinh thi » trinh tai, dinh thi, trinh tu
trinh he » trinh han, trinh hoa, trinh ky
tu hanh » du hanh, lu hanh, thuc hanh
tu canh » thu canh, tu chanh, tu can
thi diu » thi dieu, thi dau, thi du
diu hoc » du hoc, dia hoc, lieu hoc
he dai » he dan, hien dai

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

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