Perhaps you should try some spelling variations:
sach van » sach han, bach van, cach van
truc van » thuc van, truc ban, truc dan
sach va » sach xa, sach ha, sach dao
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
kem cua » em cua, keo cua, diem cua
cua tre » cua te, cuu tre, cua triet
ve cau » ke cau, va cau, ve cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach van) OR (sach va)) nang x hoi. hieu ve cau ((truc van) or (truc va)) hanh kem cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach van) OR (sach va)) nang x hoi. hieu ve cau ((truc van) OR (truc va)) hanh kem cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach van) OR (sach va)) nang x hoi. hieu ve cau ((truc van) or (truc va)) hanh kem cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach van) OR (sach va)) nang x hoi. hieu ve cau ((truc van) or (truc va)) hanh kem cua tre*.