Perhaps you should try some spelling variations:
sach nghiep » cac nghiep, tac nghiep, doanh nghiep
nghiep chan » nghiep thanh, nghiep luan, nghiep cua
hoach sach » hoc sach, hanh sach, hoa sach
chan hoc » chat hoc, nhan hoc, than hoc
thu sach » tu sach, thuat sach, thuoc sach
sach van » sach han, sach va, bach van
nghe di » nghe vi, nghe dien, nghe dan
di hoc » dai hoc, dia hoc, li 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 hoach sach nghiep chan hoc ) or ( thu sach van nghe di hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hoach sach nghiep chan hoc ) OR ( thu sach van nghe di hoc )).
• Adding a wildcard symbol may retrieve word variants: (( thu hoach sach nghiep chan hoc ) or ( thu sach van nghe di hoc ))*.