Multiple Terms Filters – AND Condition rather than OR.

We would like to have a sub filter in the category template. So that if an additional cayegory is selected from a list of siblings, the resulting posts will have to have both terms assigned before being displayed.

Is there a way to do this?

If we use the multiple terms filter all posts from the terms identified are listed. Again is it possible to only list posts that have been assign all the terms.

post1 – term1
post2 – term1, term2
post3 – term2
post4 – term1, term2

filter with term1 and term2 only lists post2 and post4

Thanks in advance