Perhaps you should try some spelling variations:
dinh tri » chinh tri
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
dinh ve » dinh ket
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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: te sach ky nang xa hoi. hieu ve cac duc va ((dinh tri) OR (((dinh ve) OR (dinh van)))) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. hieu ve cac duc va ((dinh tri) or (((dinh ve) OR (dinh van)))) cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. hieu ve cac duc va ((dinh tri) or (((dinh ve) OR (dinh van)))) cua tre*.