The Anime Series is “Luck & Logic”. Sonarr seems to be getting results from Nyaa for “Luck and Logic” where the ampersand is converted. The problem is that the specific release that I want (horriblesubs) categorizes the series as “Luck & Logic”. Therefore it does not find that release.
What should I do to have Sonarr search for both & and and?
There is nothing you can do, in 99% of releases and is used over &, so Sonarr uses and. You can grab the release manually and set the proper label and Sonarr should be able to import it.