Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
te sach » toc sach
cao duc » dao duc, cao suc, giao duc
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
di cuu » di cau, di cua, dinh cuu

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 ky nang xa hoi. ((hieu ve) or (hieu va)) cao duc ((ban hanh) or (ban thanh)) di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cao duc ((ban hanh) OR (ban thanh)) di cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. ((hieu ve) or (hieu va)) cao duc ((ban hanh) or (ban thanh)) di cuu tre*.