Perhaps you should try some spelling variations:
khao nghiem » khao nghiep
hoach khao » hoach ha, hoach giao, hoach thay
nghiem dau » nghiep dau, nghiem va, nghiem ban
sach day » sach dat, sach dau, sach hay
sach dao » lanh dao
nghe adn » nghe dan, nghe san, nghe son
adn hoc » ad hoc
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 adn hoc ) or ( thu hoach khao nghiem dau hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu ((sach day) OR (sach dao)) nghe adn hoc ) OR ( thu hoach khao nghiem dau hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu ((sach day) or (sach dao)) nghe adn hoc ) or ( thu hoach khao nghiem dau hoc ))*.