Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
thanh de » hanh de, thanh ve, thanh do
ve triet » va trien, su triet
hieu ve » hieu va, hieu van
duc ban » duc tan, duc van, dua ban
ty nang » ky nang, ty hang, ly nang
cuu tre » cua tre, cau tren, cau treo
ve pham » vi pham, v pham, ve phan

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: thu sach ((ty nang) OR (ty xang)) xa hoi. hieu ve pham duc ban thanh de ((cuu tre) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty nang) OR (ty xang)) xa hoi. hieu ve pham duc ban thanh de ((cuu tre) or (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty nang) OR (ty xang)) xa hoi. hieu ve pham duc ban thanh de ((cuu tre) or (ve triet))*.