Ok, I’ve added ros1 and ros2 to the mandatory list and we can see how things get used.
Yes, you can filter searches by query as well as tags.
Here’s a query which requires tf and tf2 tags as well as the search terms geometry and roscpp as an example. Tagged filtered search control is in the sidebar. You can see in in the url as tags:tf2,tf and the search query query:geometry%20roscpp