In the version I'm downloading the "text" looks to be scanned documents. They're images of words. So you can't search for specific text. If I wanted to search for the word "toilet", I can't do it.
I run linux, and Adobe makes a reader, but I don’t have it installed yet. So I’m using Okular, a universal document viewer, that is part of KDE 4.2. I can search just fine, and yes, it is the marked up photocopy version.