Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
lam duc » lam duoc, pham duc, nam duoc
cua tre » cuu tre, cua triet, dua tren
ban anh » ban hanh, ban banh, ban danh
duc ban » duc tan, duc van, dua ban
van lam » van nam
xang xa » lang xa, mang xa, ang xa
anh vi » hanh vi, anh va, anh ve
cua te » cua tu

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) or (toc sach)) ty xang xa hoi. hieu van lam duc ban anh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) ty xang xa hoi. hieu van lam duc ban anh vi ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) ty xang xa hoi. hieu van lam duc ban anh vi ((cua tre) or (cua te))*.