Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
lam duoc » nam duoc, luat duoc, lam thuoc
thanh vi » thanh va, thanh ve, nhanh vi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
van lam » van nam
duoc va » nuoc va, duc va, duoc ma
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ma hoa. hieu van lam duoc va ((thanh vi) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoa. hieu van lam duoc va ((thanh vi) OR (hanh vi)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoa. hieu van lam duoc va ((thanh vi) or (hanh vi)) cua tre*.