Perhaps you should try some spelling variations:
nghiep duoc » nghiem duoc, nghiep cuoc, nghiep quoc
va nghiep » va nghien, lam nghiep, cac nghiep
sach dat » sach dao, sach danh, sach bai
dat nghe » day nghe, da nghe, dang nghe
hoach va » hoach xay, hanh va, doanh va
duoc hoc » quoc hoi
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach dat nghe _ hoc ) or ( thu hoach va nghiep duoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach dat nghe _ hoc ) OR ( thu hoach va nghiep duoc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( te sach dat nghe _ hoc ) or ( thu hoach va nghiep duoc hoc ))*.