Perhaps you should try some spelling variations:
su triet » su viet, ve triet
thanh di » thanh doi, thanh de, thanh do
tu sach » thu sach, su sach, te sach
duy van » duy vat, dung van
su tien » su kien, su hien, tu tieng
sach tu » sach thu, cach tu, sach ty
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
tu nang » tru nang, tu nong, tu nano
duy va » duy vat, day va, duy v
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 tu nang x hoi. hieu ve phan ((duy va) OR (duy van)) thanh di ((su triet) OR (su tien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nang x hoi. hieu ve phan ((duy va) or (duy van)) thanh di ((su triet) OR (su tien))~".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nang x hoi. hieu ve phan ((duy va) or (duy van)) thanh di ((su triet) OR (su tien))*.