Same here. Searching for books I already own on Kindle returns completely different books unrelated to the book I am searching for. Searching for author and title does not help. For instance, searching for "probability theory sivia" returns books on biology, the JFK assassination, fish oil, "standards and expectations", theatre, etc., and one book on "Le raisonnemet bayesien" which may have something to do with probability theory. But it does not return the book on probability theory by Sivia.

Edit: See for yourself: http://books.google.com/ebooks?as_brr=5&q=probability+th...