Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dinh va » dinh van, dinh ve, tinh va
cua tre » cuu tre, cua triet, dua tren
bai va » ban va, dai va, bai ca
cua te » cua tu
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 hien cac ((bai va) OR (mai va)) dinh va ((cua tre) OR (cua te))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu hien cac ((bai va) OR (mai va)) dinh va ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu hien cac ((bai va) OR (mai va)) dinh va ((cua tre) or (cua te))*.