Perhaps you should try some spelling variations:
luoc can » luc canh, hoc can, luoc dai
can hanh » ban hanh, van hanh, dan hanh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van dam
van cau » van dau, van hau, van chat
kem cua » em cua, keo cua, diem cua
cua tre » cua te, cuu tre, cua triet
o hoi » co hoi, o hoc, o hai

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: te sach ky nang ((o hoi) OR (xa hoi)). hieu ((van cam) OR (van cau)) luoc can hanh kem cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ((o hoi) or (xa hoi)). hieu ((van cam) OR (van cau)) luoc can hanh kem cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((o hoi) or (xa hoi)). hieu ((van cam) OR (van cau)) luoc can hanh kem cua tre*.