incrediBILL - 1:50 am on Aug 25, 2012 (gmt 0)
not just items with the word designer in the title which is how it is at the moment
They way my ecommerce sites handle that is with a tags or keywords field so all those words don't have to be in the title or description. The search then includes looking for each word in the keywords field as well and then ranks them based on the most popular purchased items in the results.
Make sure you index all these fields properly or you can reduce your search times to something pitifully slow if you have a big database and bring a somewhat busy site's server down to it's knees.
Some of my sites have so many tricked out pages and do so many queries per page (product suggestions, upsells, etc.) that anything short of a quad core CPU looks like it's in slow motion so I run dual quad core CPUs just to keep it humming along.
BTW, once you have all the keywords installed, if you design it cleverly you can make the site really user friendly by offering those lists of keywords along the side of the page in a drill down to shoppers can quickly and easily reduce the subset of products to just what they want just like on the big sites.