Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dinh vi » dinh ve, dinh viet, dinh tri
danh vi » hanh vi, danh di, danh va
xuc ban » duc ban, cuc ban, quoc ban
lam xuc » cam xuc, lam duoc
van lam » van nam
ty hang » ly hang, ty xang, thi hang
ty dang » ty xang, ky dang, ty dong
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: thu sach ((ty dang) OR (ty hang)) xa hoi. hieu van lam xuc ban ((danh vi) or (dinh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ty dang) OR (ty hang)) xa hoi. hieu van lam xuc ban ((danh vi) OR (dinh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ty dang) OR (ty hang)) xa hoi. hieu van lam xuc ban ((danh vi) or (dinh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ty dang) OR (ty hang)) xa hoi. hieu van lam xuc ban ((danh vi) or (dinh vi)) cua tre*.