Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
cua tre » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
hac xuc » chat xuc
hieu va » lieu va, hieu qua
mang xa » lang xa, mang may, dang xay
ty mang » ty xang, ty hang, tin mang
va hac » van hac, va khac, va cac
xuc va » duc va, tuc va, luc va
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) ty mang xa hoi. hieu va hac xuc va hanh vi ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) ty mang xa hoi. hieu va hac xuc va hanh vi ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) ty mang xa hoi. hieu va hac xuc va hanh vi ((cua tre) or (cua te))*.