The Spy question

I'm one of those people who are trying to use the site to record every book I've ever read. Literally, every book I'm sure I've finished since learning to read. However, there are books that were just too obscure to be remembered fully, odd, off brand children's books with generic titles, like How to be a Spy, that just don't show up in a search. So, my question is, should I accept that there are some books I'll never be able to record or is there some way to find these lost books? I'm sitting at almost 800 books on my "official record" but the inaccuracy bothers me more than it should.