Indeed. At the top of the filter popup is an Add button/link. Just keep adding in filters you need. Just bare in mind that your filters will not filter the filters. ie if you filter for planet, then add a filter for type, it will still give all entities in the galaxy, not just on tht planet you initially filtered for. However once the filter is applied everything will be used, so it will filter for entities on that planet, and of that specific type.