Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cau » van dau, van hau, van chat
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 nang x hoi. thien van cau ((duc va) OR (tuc xa)) hanh dai ((cua triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. thien van cau ((duc va) or (tuc xa)) hanh dai ((cua triet) OR (su triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. thien van cau ((duc va) or (tuc xa)) hanh dai ((cua triet) OR (su triet))*.