Originally Posted by YusukeUramesh

Only Full Blurays (and some, not all) have these audios

Usually when someone make an encode he removes the extras or those audios, because it makes the size unnecessary more big

So in short you need the Full Bluray (or DVD)

I'll look in those sections, Thanks! It would have been awesome if some tracker had a tag or section with releases which had that audio description track.