Sorry about the lack of function in the search capability. We look to improve the site from time to time but can’t give any commitments.
A possible alternative is just to use Google directly and add site:www.myeclipse.com to your search terms.
As for the page expired problem, I’ve raised a bug for this but could you provide a bit more information, as I couldn’t replicate it? Does it happen when you’ve been away from the search results page for some time?