Perhaps you should try some spelling variations:
nghiem dau » nghiep dau, nghiem va, nghiem ban
ha nghiem » khao nghiem, thi nghiem, thu nghiem
sach day » sach dat, sach dau, sach hay
sach dao » lanh dao
hoach ha » hoach va, hoach xay, hoach hoi
nghe ad » nghe adn, nghe cad, nghe ar
dau hoc » dai hoc, du hoc, dan hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu ((sach day) or (sach dao)) nghe ad hoc ) or ( thu hoach ha nghiem dau hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu ((sach day) OR (sach dao)) nghe ad hoc ) OR ( thu hoach ha nghiem dau hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu ((sach day) or (sach dao)) nghe ad hoc ) or ( thu hoach ha nghiem dau hoc ))*.