Perhaps you should try some spelling variations:
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cuc ban » cua ban, cac ban, cuu ban
duc van » duc va, duc tan, duc manh
kem cua » em cua, keo cua, diem cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho
o hai » co hai, so hai, o lai

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 ky nang ((x hoi) or (o hai)). hieu va cam ((cuc ban) or (duc van)) hanh kem cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((x hoi) OR (o hai)). hieu va cam ((cuc ban) OR (duc van)) hanh kem cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((x hoi) or (o hai)). hieu va cam ((cuc ban) or (duc van)) hanh kem cua tre*.