Go to Google and type Type site: into the search bar. Type in the website's address without the www prefix. Press space and enter your search terms.
Using the Chrome browser, type the website you want to search into the address bar. When you see the "Press Tab to search", hit Tab โน. Enter your search terms.
For both methods, press โต Enter after you've entered your search terms. Your search results will appear.
Type in your site's address without the "www" part. This should go immediately after the site: tag with no space in between.
For example: to search Facebook, you would type site:facebook.com.