Perhaps you should try some spelling variations:
cach thoi » cac thoi, cach thuc
cach noi » hanh noi, anh noi, cau noi
sach bai » sach dao, cac bai, sach xa
sach doi » sach hoi, sach moi, sach dao
doi hoat » toi hoat, doi hoa, doi hoac
te sach » toc sach
bai hoc » dai hoc
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 hoc ) or ( te ((cach noi) OR (cach thoi)) chuc ))) or ( su sach doi hoat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( te sach bai hoc ) OR ( te ((cach noi) OR (cach thoi)) chuc ))) OR ( su sach doi hoat ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( te sach bai hoc ) or ( te ((cach noi) OR (cach thoi)) chuc ))) or ( su sach doi hoat ))*".