Ctrl+f is great, but you end up losing the part of the book you were at before you started searching. So basically I needed to have 4 copies open at a time. 3 for different parts of the book I needed to refer to and one for searching. This made the actual size of the text way too small on a laptop screen.
Some of the problems could probably be solved with bookmarking software, but then you have to remember where each bookmark is instead of glancing at it.