Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh nghe » trinh nghien, trinh he, trinh nha
tranh thi » tranh thai, tran thi, trang thai
trinh thi » trinh tai, dinh thi, trinh tu
nghe dai » nghe dan, nghe di, nghe hai
tu hanh » du hanh, lu hanh, thuc hanh
tu canh » thu canh, tu chanh, tu can
diu hoc » du hoc, dia hoc, lieu 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 trinh nghe dai hoc ) or ( tu canh ((tranh thi) OR (trinh thi)) diu hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hanh trinh nghe dai hoc ) OR ( tu canh ((tranh thi) OR (trinh thi)) diu hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu hanh trinh nghe dai hoc ) or ( tu canh ((tranh thi) OR (trinh thi)) diu hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu hanh trinh nghe dai hoc ) or ( tu canh ((tranh thi) OR (trinh thi)) diu hoc ))*.