Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
cua tre » cua te, cuu tre, dua tren
dinh va » dinh van, dinh ve, tinh va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cao va » cao van, tao va, co va
lao va » tao va, bao va, dao va

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