Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
dinh cua » sinh cua, dinh cu, tinh cua
dinh cuu » dinh chi
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac bao » cach bao, cac bai, cac ban
cua tre » cua te, cuu tre, cua triet
bao va » bao ve, tao va, ban va
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. ((hieu vien) OR (thieu nien)) cac bao va ((dinh cua) OR (dinh cuu)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. ((hieu vien) or (thieu nien)) cac bao va ((dinh cua) OR (dinh cuu)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((hieu vien) or (thieu nien)) cac bao va ((dinh cua) OR (dinh cuu)) cua tre*.