I think the chance of just getting any recipe from a vault run is extremely slim, I have done countless of vault runs and only getting a handful of recipes.
And while reipe fragments is a thing, 99% of them are for weird eldarium weapons that at best are MEH 
As someone suggested, try talking to other players, but be prepared that no one will have a Grandmaster scroll, heck even cooking recipes on Siptah feels like a joke being way to hard to obtain 
Personally I think the chance of us ever getting server transfers back is worse than finding the Grandmaster recipes 
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