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
cac ban » cac dan, cac van, can 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, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

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 hoi)). hieu va cam ((cac 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 hoi)). hieu va cam ((cac ban) OR (duc van)) hanh kem cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((x hoi) or (o hoi)). hieu va cam ((cac ban) or (duc van)) hanh kem cua tre*.