Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
va triet » va thiet, ve triet, cua triet
vat hanh » vat thanh, van hanh, va hanh
can thuc » dan thuc, van thuc, cay thuc
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu van
hieu va » lieu va, hieu qua
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: tu sach _ sang ma hoi. ((hieu ve) OR (hieu va)) can thuc vat hanh vi ((va triet) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach _ sang ma hoi. ((hieu ve) or (hieu va)) can thuc vat hanh vi ((va triet) OR (va trien))~".
• Adding a wildcard symbol may retrieve word variants: tu sach _ sang ma hoi. ((hieu ve) or (hieu va)) can thuc vat hanh vi ((va triet) OR (va trien))*.