Perhaps you should try some spelling variations:
sach han » sach tham, sach danh, sach nang
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
sach va » sach xa, sach ha, sach dao
hieu ve » hieu va, hieu van
hanh de » hanh ve, hanh kem
cua tre » cua te, cuu tre, cua triet
ve cau » ke cau, va cau, ve cac
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach va) OR (sach han)) nang x hoi. hieu ve cau truc van hanh de cua tre~.
• Adding a wildcard symbol may retrieve word variants: su ((sach va) or (sach han)) nang x hoi. hieu ve cau truc van hanh de cua tre*.