Perhaps you should try some spelling variations:
nghiep vung » nghiep dung, nghiep hung, nghiep nhung
trach nhiem » trac nghiem
sach trach » sach tranh, sach truc, sat trach
tai nghiep » mai nghiep, tac nghiep, trai nghiem
thu sach » tu sach, thuat sach, thuoc sach
nhiem va » nghiem va, hiem xa
sach tai » sach bai, sach tham, sach dao
vung moc » dung mo, dung moi, dung mot
te sach » toc sach
va hoc » van 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 sach trach nhiem va hoc ) or ( te sach tai nghiep vung moc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu sach trach nhiem va hoc ) OR ( te sach tai nghiep vung moc )).
• Adding a wildcard symbol may retrieve word variants: (( thu sach trach nhiem va hoc ) or ( te sach tai nghiep vung moc ))*.