Perhaps you should try some spelling variations:
su triet » su viet, ve triet
thanh vi » hanh vi, thanh va, thanh ve
xa thanh » va thanh, ha thanh, ta thanh
tu sach » thu sach, su sach, tu cach
cac tac » cac toc, cac bac, cac dac
su tien » su kien, su hien, tu tieng
hieu ve » hieu va, hieu van
te sach » toc sach
tac xa » tuc xa, tac da
xang o » lang o, tang o, dang o
ve cac » va cac, vien cac
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) OR (te sach)) ty xang o hoi. hieu ve cac tac xa thanh vi ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty xang o hoi. hieu ve cac tac xa thanh vi ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ty xang o hoi. hieu ve cac tac xa thanh vi ((su triet) or (su tien))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ty xang o hoi. hieu ve cac tac xa thanh vi ((su triet) or (su tien))*.