Perhaps you should try some spelling variations:
ve triet » va trien, su triet
tay lang » tai lang, tay tang, tay quang
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cao luc » bao luc, cao duc, cao suc
va cao » va cac, va co, va dao
y lang » o lang, _ lang, yen lang
ca ve » ca va, va ve

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