Perhaps you should try some spelling variations:
nghiep duoc » nghiem duoc, nghiep cuoc, nghiep quoc
thu doanh » thu oanh, tri doanh, thu hoach
va nghiep » va nghien, lam nghiep, cac nghiep
dao nghe » day nghe, dat nghe, nao nghe
doanh va » doan va, doanh tai, doanh cua
duoc hoc » quoc hoi
te sach » toc sach
da nghe » day nghe, va nghe, dang nghe
d hoc » du hoc, ad hoc, de hoc

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 ((dao nghe) OR (da nghe)) d hoc ) or ( thu doanh va nghiep duoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach ((dao nghe) OR (da nghe)) d hoc ) OR ( thu doanh va nghiep duoc hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( te sach ((dao nghe) OR (da nghe)) d hoc ) or ( thu doanh va nghiep duoc hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( te sach ((dao nghe) OR (da nghe)) d hoc ) or ( thu doanh va nghiep duoc hoc ))*.