Keyword searches do not seem to include the author field, which makes it impossible to search by author for books for which the author's name does not appear in promotional/descriptive material.
I've found another bug. All titles under "Zondervan" are actually Rowman&Littlefield.
https://ebooks.noet.com/search?context=product&sortBy=bestselling&limit=60&filters=Zondervan%3A5004_Publisher