Depends how obscure. I would suggest using qBittorrent, enabling the searchers, downloading and configuring Jackett, creating a rutracker dot org account (just use a translation feature), tying that into Jackett's search then searching with Jackett running for the films. You can find a surprising amount in old dvd rips (especially from Russian sites) though there are some things that are just dead (no seeds) or don't exist outside of private trackers. Some of the most obscure content only exists on the most elite, hard to get into trackers, many of them not open to new user registration on any level anymore.