Perhaps you should try some spelling variations:
hieu hien » bieu hien, chieu chien, dieu khien
dieu hien » dieu khien, dieu kien, bieu hien
cac giai » tac gia, cuu giai, hoc giai
cua tre » cuu tre, cua triet, dua tren
dinh ve » dinh ket, dinh van
va dinh » van dinh, va kinh, va tinh
giai va » giai van, gia va, giai ma
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
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) OR (dieu hien)) cac giai va dinh ve ((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) OR (dieu hien)) cac giai va dinh ve ((cua tre) or (cua te))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((hieu hien) OR (dieu hien)) cac giai va dinh ve ((cua tre) or (cua te))*.