Perhaps you should try some spelling variations:
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
va triet » va trien, ve triet, cua triet
so sach » bo sach, co sach, hoc sach
so sanh » do sanh
ly nang » ky nang, ly hang, ly vang
nang ma » tang ma, sang ma, nang cao
qua cau » quan cau, qua cac, qua ca
ma hoi » mai hoi, xa hoi, ma hoa
thiet » thieu

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