Dear aviation and forum enthusiasts,
Firstly I would like to thank you for your kind answers and for the support that you have offered. Some of the answers were of great help to me.
Finally, I can say that my problem is solved and I hope that with this post I can help many others who are interested in the same subject as I was.
This is the website that I have found and it is pretty complete regarding the aviation data about the small aerodromes that are not in the AIP:
link
Used it carefully and good luck!
Clear skies and tailwinds to all of you!
Kind regards,
Andrei P.