Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac luc » cau luc, coc luc, cac nuoc
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
y lang » o lang, _ lang, tay lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y lang xa hoi. hieu va cac luc ((va hanh) or (va danh)) ca ((cua triet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y lang xa hoi. hieu va cac luc ((va hanh) OR (va danh)) ca ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y lang xa hoi. hieu va cac luc ((va hanh) or (va danh)) ca ((cua triet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: so sach y lang xa hoi. hieu va cac luc ((va hanh) or (va danh)) ca ((cua triet) OR (cua viet))*.