Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
van lam » van nam
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
van am » van nam, van dam, van ai
va dan » ca dan, va dao, va dau
x hoi » xa hoi, o hoi, x ho

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu ((van am) OR (van lam)) thuc ((va dan) OR (va hanh)) mai va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang x hoi. hieu ((van am) OR (van lam)) thuc ((va dan) or (va hanh)) mai va triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu ((van am) OR (van lam)) thuc ((va dan) or (va hanh)) mai va triet*.