Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
thu sach » tu sach, thuat sach, thuoc sach
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
va triet » va thiet, va trien, ve triet
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
ve ban » te ban, va ban, ve bao
ban bo » can bo, ban do, ban co
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: thu sach ky nang x hoi. hieu ve ban bo ((van hanh) OR (ban hanh)) di ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x hoi. hieu ve ban bo ((van hanh) or (ban hanh)) di ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x hoi. hieu ve ban bo ((van hanh) or (ban hanh)) di ((cua triet) OR (va triet))*.