The Spanish term "amazon libros en espanol" roughly translates as "amazon books in Spanish." The word "Amazon" refers either to the Amazon rain forest area or to the website Amazon.com. A clearer phrasing would be "books in Spanish from Amazon.com" or "books in Spanish from the Amazon."
Amazon.com started out as an online bookstore but quickly expanded to sell many other items, including toys, apparel, audio and video. It is the largest online retailer in the United States as of April 2015. There is a separate Amazon website for 14 different countries, including Spain and Mexico.
The Amazon rain forest is located in South America and spans over two million square miles.