Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
nam truc » nam truoc, nam thuc, nam trung
va triet » va thiet, ve triet, cua triet
cam truc » cau truc, lam truoc, nam truoc
va hanh » van hanh, va thanh, va danh
bo sach » co sach, hoc sach
sach ly » sach y, sach lo, sach ty
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
ma hoi » mai hoi, xa hoi, ma hoa

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: bo sach ly nang ma hoi. hieu qua ((cam truc) OR (nam truc)) va hanh vi ((va triet) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ly nang ma hoi. hieu qua ((cam truc) or (nam truc)) va hanh vi ((va triet) OR (va trien))~".
• Adding a wildcard symbol may retrieve word variants: bo sach ly nang ma hoi. hieu qua ((cam truc) or (nam truc)) va hanh vi ((va triet) OR (va trien))*.