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
sach ky » sac ky, sach ty, sach kem
cac bao » cach bao, cac bai, cac ban
dinh va » dinh van, tinh va, sinh va
dinh ve » dinh ket, dinh van
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) OR (sach y)) nang x hoi. hieu hien cac bao va ((dinh va) OR (dinh ve)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang x hoi. hieu hien cac bao va ((dinh va) OR (dinh ve)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang x hoi. hieu hien cac bao va ((dinh va) OR (dinh ve)) cua triet*.