Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh tai » thanh tai, hang tai, han tai
te sach » toc sach
tai cua » thai cua, tai cuc, tri cua
duc van » duc va, duc tan, duc manh
luc van » luoc van, luu van, luc va
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
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) OR (hoc sach)) ky nang o hoi. hieu ve cac ((luc van) OR (duc van)) hanh tai cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ky nang o hoi. hieu ve cac ((luc van) or (duc van)) hanh tai cua tre*.