Perhaps you should try some spelling variations:
hoi nghiem » hoi nhiem, khoi nghiep, thi nghiem
hoach hoi » hoc hoi, hoach ha, sach hoi
sach dao » lanh dao
dao nghe » day nghe, da nghe, dat nghe
tu sach » thu sach, su sach, te sach
nghe de » nghe det, nghe di, nghe te
de hoc » te hoc, du hoc, dien hoc
su hoc » du hoc, so hoc, su ho
tu hoc » te 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 dao nghe de hoc ) or ( thu hoach hoi nghiem ((su hoc) or (tu hoc)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dao nghe de hoc ) OR ( thu hoach hoi nghiem ((su hoc) OR (tu hoc)) )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dao nghe de hoc ) or ( thu hoach hoi nghiem ((su hoc) or (tu hoc)) ))*.