Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
su sach » so sach, vu sach
cao hoi » cau hoi, cao hoc, tao hoi
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
y nang » ky nang, ly nang, v nang
co hoi » co hoc, co loi
ve cac » va cac, vien cac

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 ((cao hoi) OR (co hoi)). hieu ve cac tac ((va hanh) or (gia thanh)) lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((cao hoi) OR (co hoi)). hieu ve cac tac ((va hanh) OR (gia thanh)) lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang ((cao hoi) OR (co hoi)). hieu ve cac tac ((va hanh) or (gia thanh)) lai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((cao hoi) OR (co hoi)). hieu ve cac tac ((va hanh) or (gia thanh)) lai cua triet*.