Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
duoc van » duoc va, duc van, duoc ban
lam duoc » nam duoc, luat duoc, lam thuoc
hieu van » hieu va, thien van, lieu va
sang tao » hang tai
van lam » van nam
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
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 ((nang ma) or (((tang ma) or (sang tao)))) hoi. hieu van lam duoc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang ma) OR (((tang ma) OR (sang tao)))) hoi. hieu van lam duoc van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang ma) or (((tang ma) or (sang tao)))) hoi. hieu van lam duoc van hanh vi cua tre*.