Perhaps you should try some spelling variations:
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
va cao » va cac, va co, va dao
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
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 nang) OR (v nang)) xa hoi. hieu va cao duc ((van hanh) or (va danh)) ca ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) xa hoi. hieu va cao duc ((van hanh) OR (va danh)) ca ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (v nang)) xa hoi. hieu va cao duc ((van hanh) or (va danh)) ca ve triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (v nang)) xa hoi. hieu va cao duc ((van hanh) or (va danh)) ca ve triet*.