It is possible that:
* He is not a professional actor. He may have been involved in local productions or amateur projects that are not publicly documented.
* He may be using a different name professionally. You could try searching for him using different variations of his name or any other known aliases.
* He might be a relatively unknown actor. Smaller roles or appearances in less popular projects might not be easily accessible online.
If you have more specific information about him, such as the kind of roles he might have played or the time frame of his potential involvement, it could be helpful in identifying any projects he has been in.