We are all used to "google-like" search, where accents and even typos in the query string do not really affect the search results. However Paperless seems to be a little bit too rigid when it comes to search. For instance, Zürich or Telefónica doesn't match Zurich and Telefonica, a behaviour which can frustrate some searches.

It looks like this can be achieved with the current SQLite backend by providing some conversion tables that I guess they are so common that they already exist in the open source community. And after a quick look at Stack Overflow I found some insight which I hope they help.