I don't know much about these books, and I only see two of them on the site, but I think I might look into getting one. Perhaps someone here can tell me more about these books.

This one is titled: The Incredible Ghostbusters: Against Count The Vampire
A rough translation of what the site says about the book:
From the publisher:
What can be more captivating than the hunting of ghosts? You take an ectoplasmic gun, trap, and go forward! Sharp sensations are guaranteed!
True, this matter is new and unsafe. Therefore, it is better to use the services of experienced professionals. “Extraordinary hunters of ghosts” - Egon, Peter, Ray and Winston - invite you to join them, while ghosts, specters, goblins, and genuine horrors are found.
The hunting for ghosts continues!!!
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This one is titled: The Incredible Ghostbusters: Against The Green Fog
A rough translation of what the site says about the book:
From the publisher:
This book continues the new series 39 parrots, in which inquisitive boys and girls will meet with their old friends: The Ghostbusters and they are also friends and favorites of millions of others in Western Europe and America. Extraordinary hunters of ghosts - Egon, Peter, Ray and Winston - invite you to join them, while ghosts, specters, goblins and genuine horrors are found.