Perhaps you should try some spelling variations:
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
cuu tre » cua tre, cau tren, cau treo
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
ca cuu » cap cuu, cua cuu, ca cua

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: tu sach v nang ((le hoi) OR (ma hoa)). hieu va cac tuc ((ban hanh) OR (van hanh)) ca cuu tre~.
• Adding a wildcard symbol may retrieve word variants: tu sach v nang ((le hoi) or (ma hoa)). hieu va cac tuc ((ban hanh) or (van hanh)) ca cuu tre*.