Perhaps you should try some spelling variations:
sach bai » cac bai, sach xa
toi chuc » hoi chuc, loi chuc, toi chu
sach doi » sach hoi, sach moi, sach dat
sach dao » lanh dao
te sach » toc sach
bai hoc » dai hoc
cac toi » cac thoi
te cac » tu cac, ve cac, te cao

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 bai hoc ) or ( te cac toi chuc ))) or ( su ((sach doi) or (sach dao)) hoat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( te sach bai hoc ) OR ( te cac toi chuc ))) OR ( su ((sach doi) OR (sach dao)) hoat )).
• Adding a wildcard symbol may retrieve word variants: (((( te sach bai hoc ) or ( te cac toi chuc ))) or ( su ((sach doi) or (sach dao)) hoat ))*.