The search results for a full page show multiple results, since it shows in multiple titles. 10^29 to be precise. That is the same result with any full page. If every page is present under every possible title, and the number of possible pages is way bigger than possible titles, it means there are multiple volumes with the same title but different contents, correct?
title1 = [abc] [cba]
title1 = [ght] [asd]
So the uniqueness of a volume is defined by a combination of title+content?
Yes, you are correct. In fact, you can search for volumes by title in the Search section. Just scroll to the bottom of the page, and you’ll see “title search:”. Clicking on “more title matches” will let you browse all of the found volumes for that title.