Perhaps you should try some spelling variations:
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
xuc ban » duc ban, cuc ban, quoc ban
ve cac » va cac, vien cac
vi cua » vai cua, di cua
sac ky » cac ky, sai ky
va cai » va cac, va bai, va dai
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: tu ((sac ky) or (sach ty)) nang x hoi. hieu ((va cai) or (ve cac)) xuc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (sach ty)) nang x hoi. hieu ((va cai) OR (ve cac)) xuc ban hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (sach ty)) nang x hoi. hieu ((va cai) or (ve cac)) xuc ban hanh vi cua tre*.