Cugel is unique. You won’t find similar books by Vance. The closest you can get are: Cugel’s Saga, The Eyes of the Overworld, Liane der Wanderer (as in The Dying Earth [although it’s more the sun which is dying]), Rhialto the Marvellous and the Showboat World. But most of his books are worth being read anyway, with Chateau D’If being his best short story. And you could read them in German because Lore Straßl did a fantastic job on many books.