Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dinh vi » dinh ve, dinh viet, dinh tri
danh vi » hanh vi, danh di, danh va
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao

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: tu sach ky lang xa hoi. hieu ((va cam) OR (va cao)) thuc va ((danh vi) OR (dinh vi)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. hieu ((va cam) or (va cao)) thuc va ((danh vi) OR (dinh vi)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. hieu ((va cam) or (va cao)) thuc va ((danh vi) OR (dinh vi)) cua tre*.