Perhaps you should try some spelling variations:
trinh nghien » kinh nghiem, trinh thiet, trinh dien
trai nghiem » trac nghiem, thi nghiem
trinh nghe » trinh he, trinh nha
sach trai » sach tai, sach tranh, khach trai
hoc sach » hoc sinh, hoc cac, hoc anh
thu canh » thuc hanh, thu cong, thu ban
d hoc » du hoc, ad hoc, de hoc

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

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