Product Filters - How do they work?

Hi,

my filters are not showing correctly results after selecting more parameters.

I have set these paramerers (example):

CPU: i3, i5

RAM: 8 GB, 16 GB

and product 1 assigned to i3, 8 GB, product 2 to i5, 16 GB.

When I select i3 and 16 GB, the result will be: product 1, product 2.

I need to have following result: NONE

Thanks.