Perhaps you should try some spelling variations:
sach bai » cac bai, sach xa
sach dao » lanh dao
nang noi » nang doc
noi chuc » hoi chuc, loi chuc, noi thuc
sach doi » sach hoi, sach moi, sach dat
doi hoat » toi hoat, doi hoa, doi hoac
te nang » ke nang, te bang, de nang
su sach » so sach, vu sach

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