I used to use thepiratebay.org, but recently it seems the quality of the site has degraded.
I sometimes also use 1337xx.to , but that site seems to have a very small selection.
Note that I couldn’t find an answer to this question in the wiki + meathread, so if the answer is already there, please direct my attention to it 🙏🏴☠️
In general, I recommend adding Jackett to qbittorrent. It works great and is much better than the standard search add-ons.
For this specific request, AudioBook Bay has a 30 lesson Dutch section (in a large general pack) and is dated 2022 (also available via Jackett in qbittorrent).
Thanks for this, I’ll try it. I like obscure books lol