I found this thread when trying to solve the same problem. Not sure if someone else suggested this, but I would not do intitle search for david. instead, I would search for another word I know is in the title and then sort by title (A>Z) and scroll to David. The more specific you can be with your search, the fewer notes you'll have to scroll. Without knowing about intitle search, I have been able to find pdf within the 26000 notes in my science account by searching for topic and then scrolling to author's last name in the list of retrieved notes. Alternatively, you could tag David notes with David and search within David-tagged notes. I have changed my organization multiple times to improve my ability to find papers when I need them. The improved search functions and more portable computers that lessen my reliance on mobile (stripped-down) versions of evernote means I don't need stacks and notebooks. I can tag papers I am using for a project and then delete the tag when I don't need it anymore.