Perhaps you should try some spelling variations:
nang lai » nang tai, mang lai, nang cai
hieu van » hieu va, thien van, lieu va
nam duoc » nam thuoc, da duoc, dat duoc
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
lai hoi » dai hoi, lai hoa, lai roi
duoc va » nuoc va, duc va, duoc ma
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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) or (sach ty)) nang lai hoi. hieu van nam duoc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach ty)) nang lai hoi. hieu van nam duoc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach ty)) nang lai hoi. hieu van nam duoc va hanh vi cua tre*.