Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
trinh thi » trinh tai, dinh thi, trinh tu
trinh nha » trinh phan, trinh chat, trinh chao
luu hanh » huu han
nha dien » nhan dien, nha dieu, nhanh dien
dien hoc » dien hoa, khien hoc, tin hoc
tu hanh » du hanh, lu hanh, thuc hanh
tu canh » thu canh, tu chanh, tu can
dia hoc » dia oc, dich hoc, dinh hoc
du hoc » tu hoc, duoc hoc

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 (luu hanh)) trinh nha dien hoc ) or ( tu canh trinh thi ((du hoc) or (dia hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tu hanh) OR (luu hanh)) trinh nha dien hoc ) OR ( tu canh trinh thi ((du hoc) OR (dia hoc)) )).
• Adding a wildcard symbol may retrieve word variants: (( ((tu hanh) or (luu hanh)) trinh nha dien hoc ) or ( tu canh trinh thi ((du hoc) or (dia hoc)) ))*.