Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu vien » hieu viec, thieu nien, hieu tieng
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
thu van » thuc van, thuy van, tu van
cac thu » cach thuc, cac thoi
sach ky » sach y, sach ty, sach kem
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho
vi su » va su, ve su, ki su

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 (sac ky)) nang x hoi. ((hieu vien) OR (hieu hien)) cac thu van hanh vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) nang x hoi. ((hieu vien) or (hieu hien)) cac thu van hanh vi su triet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) nang x hoi. ((hieu vien) or (hieu hien)) cac thu van hanh vi su triet*.