Perhaps you should try some spelling variations:
thien van » thi van
ban thanh » ban hanh, ban hang
sach vay » sach va, sach hay, sach nay
thanh de » hanh de, thanh ve, thanh do
nang ma » tang ma, sang ma, nang cao
hoa duc » hoa duoc, hoai duc, ho duc
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
de cua » le cua, te cua, dieu cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach vay) or (sach y)) nang ma hoi. thien van hoa duc ban thanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach vay) OR (sach y)) nang ma hoi. thien van hoa duc ban thanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: toc ((sach vay) or (sach y)) nang ma hoi. thien van hoa duc ban thanh de cua tre*.