Perhaps you should try some spelling variations:
trai nghiep » trai nghiem, trac nghiem, giai nghiep
mai nghiep » lam nghiep, xi nghiep, cac nghiep
thu khach » tnhh khach, thu hoach, he khach
sach tham » sach nha
tham nghe » thai nghe, pham nghe, tam nghe
thu sach » tu sach, thuat sach, thuoc sach
nghe lam » nghe dan, nghe va, nghe san
can hoc » van hoc, dan hoc, cao hoc
lam hoc » am hoc, lam hoa, tam 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 khach ((trai nghiep) OR (mai nghiep)) can hoc ) or ( thu sach tham nghe lam hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu khach ((trai nghiep) OR (mai nghiep)) can hoc ) OR ( thu sach tham nghe lam hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( thu khach ((trai nghiep) OR (mai nghiep)) can hoc ) or ( thu sach tham nghe lam hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( thu khach ((trai nghiep) OR (mai nghiep)) can hoc ) or ( thu sach tham nghe lam hoc ))*.