Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
su triet » su viet, ve triet
thanh ha » thanh hoa, thanh hai, nhanh ha
xa thanh » va thanh, ha thanh, ta thanh
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
su tien » su kien, su hien, tu tieng
bac xa » bac ha, tac xa, buc xa
ve cac » va cac
xang o » lang o, tang o, dang o
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) or (vien cac)) bac xa thanh ha ((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) OR (vien cac)) bac xa thanh ha ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty xang o hoi. hieu ((ve cac) or (vien cac)) bac xa thanh ha ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang o hoi. hieu ((ve cac) or (vien cac)) bac xa thanh ha ((su triet) OR (su tien))*.