Duplicate content domains ranking successfully

[kenbrother]

I have a project with 8 domains and each domain is showing the same content (including site structure) and still all sites do rank. When I search for a specific word-string in google it lists me all 8 domains.

Do you have an explanation, why Google doesn't filter those URLs to just one URL instead of 8 with the same content?

[SteveOllington]

If it's not a competitive keyword, or a phrase that's unlikely to be found elsewhere then it will rank them all. They're all indexed and they're all relevant to the query. They wouldn't all rank if other sits had that same specific word string.