Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
va lang » va nang, hoa lang
tu sach » thu sach, su sach, te sach
va hang » van hang, va nang, va hanh
cac toc » cac toi, cac nuoc, cac thoi
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang

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