Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang co » nang cao, nang doc, nang noi
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
cua tre » cua te, cuu tre, cua triet
co hai » co dai, co hoi, o hai
so van » su van, vo van
vi cua » vai cua, di cua

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 tu nang co hai. hieu ((van cac) or (van hac)) so van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang co hai. hieu ((van cac) OR (van hac)) so van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach tu nang co hai. hieu ((van cac) or (van hac)) so van hanh vi cua tre*.