Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
ve triet » su triet
va danh » va dinh, va dan, dia danh
su sach » so sach, vu sach
cao luc » bao luc, cao duc, cao suc
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, ban hanh
y lang » o lang, _ lang, tay lang
va cao » va cac, va co, va dao

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

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