Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
van anh » tuan anh, van minh

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 dang xa hoi. hieu va cac tuc ((van anh) OR (van thanh)) tai ((cua triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. hieu va cac tuc ((van anh) or (van thanh)) tai ((cua triet) OR (su triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu va cac tuc ((van anh) or (van thanh)) tai ((cua triet) OR (su triet))*.