* The name is slightly different: There might be a misspelling. Could you double-check the name?
* It's a very small or local school: A school with a less common name might not have a significant online presence.
* It's a newly established school: If it's very recent, information might not yet be widely available online.
If you can provide more information (location, type of school, etc.), I might be able to help you find it.