Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
trach nhiem » trac nghiem
sach trach » sach tranh, sach truc, sat trach
nghien de » nghiem de, nghiep ke, nghiem d
nhiem dai » nhien dai, nhiem tai, nghiep dai
thu sach » tu sach, thuat sach, thuoc sach
lu hanh » luu hanh, du hanh, ly hanh
ly anh » le anh
de hoc » te hoc, du hoc, dien hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((ly anh) or (lu hanh)) trinh nghien de hoc ) or ( thu sach trach nhiem dai hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((ly anh) OR (lu hanh)) trinh nghien de hoc ) OR ( thu sach trach nhiem dai hoc )).
• Adding a wildcard symbol may retrieve word variants: (( ((ly anh) or (lu hanh)) trinh nghien de hoc ) or ( thu sach trach nhiem dai hoc ))*.