Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
hanh trinh » canh tranh, hanh chinh
nghien te » nghiem te, nghiep ke, nghiep tu
nang nghe » lang nghe, cong nghe, van nghe
thu hanh » thuc hanh, thu thanh, thuy hanh
anh nghe » lang nghe, van nghe, anh ngu
tu canh » thu canh, tu chanh, tu can
dau hoc » dai hoc, du hoc, dan hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hanh trinh nghien te hoc ) or ( tu canh ((anh nghe) OR (nang nghe)) dau hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hanh trinh nghien te hoc ) OR ( tu canh ((anh nghe) OR (nang nghe)) dau hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu hanh trinh nghien te hoc ) or ( tu canh ((anh nghe) OR (nang nghe)) dau hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( thu hanh trinh nghien te hoc ) or ( tu canh ((anh nghe) OR (nang nghe)) dau hoc ))*.