Perhaps you should try some spelling variations:
ve triet » va trien, su triet
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
cao hoi » cau hoi, co hoi, cao hoc
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
y nang » ky nang, ly nang, v nang
toc va » hoc va, toc ta, tuc va
vi ve » va ve, gi ve, ve 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) or (co sach)) y nang cao hoi. hieu ((van cac) OR (van hac)) toc va danh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) y nang cao hoi. hieu ((van cac) OR (van hac)) toc va danh vi ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (co sach)) y nang cao hoi. hieu ((van cac) OR (van hac)) toc va danh vi ve triet*".