Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
hanh ve » hanh vi, hanh va, hanh kem
duc ban » duc tan, duc van, dua ban
lam duc » lam duoc, pham duc, nam duoc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cuu tre » cau tren, cau treo
va lam » van lam, va lap

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 y ((nang xa) OR (lang xa)) hoi. hieu va lam duc ban hanh ve ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) OR (lang xa)) hoi. hieu va lam duc ban hanh ve ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) OR (lang xa)) hoi. hieu va lam duc ban hanh ve ((cua tre) or (cuu tre))*.