Limit search sources to a subset of our SPO sites?

Hi.

In our upcoming SPO based intranet, the URL for our Intranet related sites all start with the same keyword (example: http://acme.sharepoint.com/sites/intranet_"). Ideally, when our users search for contents on any of our intranet sites, we'd like to limit the search results to content from our Intranet sites, i.e. contents from sites whose URL starts with http://acme.sharepoint.com/sites/intranet_. Is this possible accomplish out of the box?