Hmm. I think you must be trying to use a translator because it doesn't make sense to look for a book with many sides.
What is your native language? You have a Polish flag but it says you live in Germany.
"Seiten" in German is "pages" in English, not "sides." Maybe you received a short chess book and you want a long chess book?
Maybe just write what kind of book you are looking for in that language.
Hey Guys, you know these Chess books that idk are like 2 sides? I want a thick one that yeah like has many sides. But, which one do i buy myself?