Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh nha » trinh phan, trinh chat, trinh chao
trinh thi » trinh tai, dinh thi, trinh tu
tu hanh » du hanh, thuc hanh, thi hanh
tu canh » thu canh, tu chanh, tu can
diu hoc » du hoc, lieu hoc, dich hoc
dia hoc » dia oc, dich hoc, dien hoc
lu hanh » luu hanh, du hanh, ly hanh
di hoc » dai hoc, li hoc, du hoc
nha di » nha da, nha dieu, nhan 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) or (lu hanh)) trinh nha di hoc ) or ( tu canh trinh thi ((diu hoc) or (dia hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tu hanh) OR (lu hanh)) trinh nha di hoc ) OR ( tu canh trinh thi ((diu hoc) OR (dia hoc)) )).
• Adding a wildcard symbol may retrieve word variants: (( ((tu hanh) or (lu hanh)) trinh nha di hoc ) or ( tu canh trinh thi ((diu hoc) or (dia hoc)) ))*.