Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va bac » van bac, va cac, va bai
bac vo » bac bo, bac ho, bac va
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu va bac vo van hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu va bac vo van hanh vi cua tre*.