Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dang xay » dang van, van xay
cac tuc » cac toc, cac tac, cac nuoc
sach ky » sac ky, sach y, sach ty
te sach » toc sach
lang xa » lang ha, lang van
hieu ve » hieu va, hieu van
cac tu » cac thu, cach tu, cac du
va dau » va dao
dau vi » dau ve, dau va, dat vi
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: te sach ky ((lang xa) OR (dang xay)) hoi. hieu ve ((cac tuc) OR (cac tu)) va dau vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) or (dang xay)) hoi. hieu ve ((cac tuc) OR (cac tu)) va dau vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (dang xay)) hoi. hieu ve ((cac tuc) OR (cac tu)) va dau vi cua triet*.