Can’t find DVDs by ISBN

In the “Add item” interface, it offers to allow using Amazon ASINs as well as ISBNs. Several of my DVDs have ISBNs, but Listal cannot find the DVD by using the ISBN. e.g. the Bleach box set is ISBN 1421522128

Thats because that isbn doesn't exist on amazon, I searched on google and there are only 29 results for that number so it's not a well known ISBN.

www.google.co.uk/#hl=en&source=hp&q=1421522128