Perhaps you should try some spelling variations:
nghiem su » nghiem xu, nghiem ngu, nghiem dau
ha nghiem » khao nghiem, thi nghiem, thu nghiem
sach day » sach dat, sach dau, sach hay
sach dao » lanh dao
nghe cad » nghe cao, nghe ca, nghe cat
hoach ha » hoach va, hoach xay, hoach hoi
cad hoc » ad hoc, cao hoc, cac hoc
su hoc » tu hoc, du hoc, so 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 cad hoc ) or ( thu hoach ha nghiem su hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu ((sach day) OR (sach dao)) nghe cad hoc ) OR ( thu hoach ha nghiem su hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu ((sach day) or (sach dao)) nghe cad hoc ) or ( thu hoach ha nghiem su hoc ))*.