Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh nghe » trinh nghien, trinh he, trinh nha
can tranh » canh tranh, tan tran, van ranh
tranh thi » tranh thai, tran thi, trinh thi
tu hanh » du hanh, lu hanh, thuc hanh
thi dia » thi dua, thi da, thi diu
dia hoc » dia oc, dich hoc, dien hoc
di hoc » dai hoc, du hoc, vi hoc
tu can » tu ban, tu cac, thu canh

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hanh trinh nghe ((di hoc) OR (li hoc)) ) OR ( tu can tranh thi dia hoc ))~.
• Adding a wildcard symbol may retrieve word variants: (( tu hanh trinh nghe ((di hoc) or (li hoc)) ) or ( tu can tranh thi dia hoc ))*.