I tried to search in Google of the combinational expressions of 'The many things' and "the many books", and I found most of cases these expressions are followed by an attributive clause, like:
The many things people got wrong
Thank You for the Many Things You've Done
I suspected that "The many books have included this topic." (without modifier) is wrong, and the article 'the' is redundant here. Can anyone further explain the reason behind, or share different understandings?