Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
dang xay » dang van, van xay
cac tuc » cac toc, cac tu, cac tac
nang di » nang du, hang di, nang ji
tuc cam » tuc cham, tuc cac, xuc cam
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
ve cac » va cac, vien cac

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 y ((lang xa) OR (dang xay)) hoi. hieu ve cac tuc cam nang di ((va triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((lang xa) or (dang xay)) hoi. hieu ve cac tuc cam nang di ((va triet) OR (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((lang xa) or (dang xay)) hoi. hieu ve cac tuc cam nang di ((va triet) OR (ve triet))*.