Perhaps you should try some spelling variations:
ta thanh » tai thanh, va thanh, ha thanh
thanh vi » hanh vi, thanh va, thanh ve
su triet » su viet, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
su tien » su kien, su hien, tu tieng
xang o » lang o, tang o, dang o
ve cac » va cac, vien cac
tac ta » toc ta, tac da, tac tu
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty xang o hoi. hieu ve cac tac ta thanh vi ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang o hoi. hieu ve cac tac ta thanh vi ((su triet) OR (su tien)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang o hoi. hieu ve cac tac ta thanh vi ((su triet) or (su tien))*.