It's possible that:
* He may not have been in any major productions. Many actors work on smaller or independent projects that don't have widespread recognition.
* His name may be spelled differently. It's worth checking various online resources using alternative spellings or searching for him under a stage name.
* He may be a relatively new actor. His filmography might be incomplete or not yet documented in online databases.
To find more information, you could try:
* Searching online film databases like IMDb: Use different spellings of his name and experiment with search terms like "Ettore Manni actor."
* Looking for local film festivals or productions: If he is working in a specific area, local resources might provide information about his work.
* Reaching out to him directly: If you know how to contact him, you could ask him about his filmography.
Good luck in your search!