The search feature, I'm finding, is set up a bit oddly right now. I tried an advanced search to find a Folded Dalah (is this a real item) and got nothing. I did a search on a Singer 15-91 and got everything ever written!
When you go to 'Advanced Search' there are 2 tabs at teh top. right now it (for me, on my computer) is defaulting to Search Multiple Content Types. I couldn't find anything. I toggled to Search Single Content Types. Under that tab the forums are broken down into sections so you can search only the forum pertaining to what you are looking for. I chose Tutorials but no results for a Folded Dalah.