Perhaps you should try some spelling variations:
trach nhiem » trac nghiem
thuat sach » thuat lanh, thuat san
sach trach » sach tranh, sach truc, sat trach
tai nghiep » mai nghiep, trai nghiem, giai nghiep
tac nghiep » cac nghiep, trac nghiem, sach nghiep
nhiem va » nghiem va, hiem xa
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: (( thuat sach trach nhiem va hoc ) or ( te sach ((tai nghiep) OR (tac nghiep)) vung moc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuat sach trach nhiem va hoc ) OR ( te sach ((tai nghiep) OR (tac nghiep)) vung moc ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thuat sach trach nhiem va hoc ) or ( te sach ((tai nghiep) OR (tac nghiep)) vung moc ))*".