This article explains how to use Google to search within a single website or type of domain. These instructions work from any device that supports Google searches.
Use Google to Search Within a Specific Website | Search Only One Website with Google | Tech Hawk
It's easy to search on one website, but there's a catch.
Type site: into the Google search bar followed by the name of the website you want to limit your search to. Here's an example:
Follow the website name with a space and then type the search term. For example:
