Perhaps you should try some spelling variations:
ve triet » va trien, su triet
hau luoc » hau loc, khai luoc, muu luoc
va triet » va thiet, va trien, cua triet
van hanh » van thanh, ban hanh, van anh
luoc van » luoc can, luoc va, luc van
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
van hoc » van hoa
van hoi » van hoa, van hoe, van loi
ky lang » ky nang, ky dang, ky tang
qua hau » qua hai, qua bau, qua dau

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: co sach ky lang ((van hoi) OR (van hoc)). hieu qua hau luoc van hanh vi ((va triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky lang ((van hoi) OR (van hoc)). hieu qua hau luoc van hanh vi ((va triet) or (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: co sach ky lang ((van hoi) OR (van hoc)). hieu qua hau luoc van hanh vi ((va triet) or (ve triet))*.