Thank you! I'm seeing some Scribd results though some still seem to be missing.
An example:
Eleni Sikelianos has one book on Scribd but their book doesn't show up in discovered books. Unlike the previously linked author they don't show up as a suggested author though their book is the first result under the Books tab on the Scribd website here:
https://www.scribd.com/search?conten...i%20Sikelianos