Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » thien van, lieu va, hieu ve
ban banh » ban hanh, ban anh, ban danh
banh dai » benh dai, ban dai, vanh dai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
lam cuc » lam cua, lam duoc, pham cuc
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, cua triet

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 ky ((nang xa) OR (nang cao)) hoi. ((hieu van) OR (hieu va)) lam cuc ban banh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang xa) or (nang cao)) hoi. ((hieu van) OR (hieu va)) lam cuc ban banh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (nang cao)) hoi. ((hieu van) OR (hieu va)) lam cuc ban banh dai cua tre*.