Perhaps you should try some spelling variations:
nghiem duoc » nghiem thuoc, nghe duoc
va nghiem » van nghiem, va nghien, va nghiep
sach dao » lanh dao
dao nghe » day nghe, da nghe, dat nghe
hoach va » hoach xay, hanh va, doanh va
duoc hoc » quoc hoi
te sach » toc sach
nghe ad » nghe adn, nghe cad, nghe ar

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 ad hoc ) or ( thu hoach va nghiem duoc hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach dao nghe ad hoc ) OR ( thu hoach va nghiem duoc hoc )).
• Adding a wildcard symbol may retrieve word variants: (( te sach dao nghe ad hoc ) or ( thu hoach va nghiem duoc hoc ))*.