Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
hieu hieu » hien hieu, hieu hien, thien hieu
su triet » su viet, su tien, ve triet
hieu cac » hieu luc, hieu va, hieu van
dinh vi » dinh ve, dinh viet, dinh tri
va dinh » van dinh, va kinh, va tinh
sach ky » sac ky, sach ty, sach kem
cac bo » bac bo, cac co
bo va » bao va, do va, so 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 hieu cac bo va dinh vi ((cua triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach y)) nang x hoi. hieu hieu cac bo va dinh vi ((cua triet) OR (su triet))~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang x hoi. hieu hieu cac bo va dinh vi ((cua triet) OR (su triet))*.