It's possible there are multiple people with this name, or that this person hasn't worked on any projects that have public records.
To get a more precise answer, you could try:
* Searching online with more specific keywords: For example, try "Charles Rivero actor" or "Charles Rivero filmmaker" along with the specific project you are looking for.
* Checking movie databases: Sites like IMDb or The Movie Database might have information about actors, directors, and other personnel, even if they're not very famous.
* Looking for news articles or interviews: If Charles Rivero is a known figure, there might be articles or interviews mentioning their work.
If you have any other details about the person or the project, it will be easier to find the information you're looking for.