Perhaps you should try some spelling variations:
cac thoi » cac toi, cac hop, cac thu
lang van » dang van, tang van, hoang van
tu sach » thu sach, su sach, te sach
danh vi » hanh vi, dinh vi, danh di
ta danh » tac danh, tao danh, tap danh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
mang xa » lang xa, mang may, dang xay
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 ((mang xa) OR (lang van)) hoi. hieu ve ((cac thoi) OR (cac tro)) ta danh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((mang xa) or (lang van)) hoi. hieu ve ((cac thoi) OR (cac tro)) ta danh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang xa) or (lang van)) hoi. hieu ve ((cac thoi) OR (cac tro)) ta danh vi cua tre*.