Perhaps you should try some spelling variations:
thien van » thi van
cua triet » cua viet, su triet, va triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
dao duc » giao duc, tao duoc
va danh » va dan, va hanh, dia danh
va dinh » van dinh, va kinh, va tinh
lai cua » dai cua, hai cua, lai chau

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 ((nang xa) OR (lang xa)) hoi. thien van dao duc ((va danh) OR (va dinh)) lai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((nang xa) or (lang xa)) hoi. thien van dao duc ((va danh) OR (va dinh)) lai cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang xa) or (lang xa)) hoi. thien van dao duc ((va danh) OR (va dinh)) lai cua triet*.