When you go in and open just the main sub-forum for the Home Interior section scroll down towards the bottom..
On the right side you will see three options...that says:
Display Options
Underneath that will be 3 sub windows where you can choose options:
Sort By: Sort Order: From The:
You can click the box underneath to select the time frame you want to search from..
Utilize the From The: section and it will pop up a small window to choose your search parameters.... hit show threads...
and you will see all the old threads for you to search.
I've noticed that most of the sub-forums are keeping about a month's worth of materials up and you'll have to select to show threads back farther as I mentioned above..
Make sense? Hope that helped.. If not, let me know.