Perhaps you should try some spelling variations:
nang dai » nang tai, lang dai, nang cai
hanh dai » hanh tai, hanh dao, vanh dai
nang dau » hang dau, xang dau, nang du
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
luc va » duc va, tuc va, loc va

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

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