Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu luc » hieu luat, hieu qua
danh dai » danh dau, danh di, danh sai
chat xuc » chat huu, cam xuc, chao xu
va danh » va dinh, va dan, va hanh
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
xuc va » duc va, tuc va, luc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((nang xa) or (nang ma)) hoi. ((hieu luc) or (hieu va)) chat xuc va danh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang xa) OR (nang ma)) hoi. ((hieu luc) OR (hieu va)) chat xuc va danh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang xa) or (nang ma)) hoi. ((hieu luc) or (hieu va)) chat xuc va danh dai cua tre*.