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I tried
(search term site:stackoverflow.com) OR (search term site:superuser.com) OR (search term site:stackexchange.com)search term site:stackoverflow.com,superuser.com,stackexchange.comsearch term site:stackoverflow.com site:superuser.com site:stackexchange.comNone of them works. What is the correct way to search?
After a bit of experimenting, it appears you can do this by putting the OR operator between the sites:
search site:stackoverflow.com OR site:superuser.com OR site:stackexchange.com
This gives you results from any of the sites.
If you do this kind of search frequently on the same set of sites, you can create a Google Custom Search. You add the sites you want to search to it and it gives you a url to go to when you want to do a search. All searches from this url only contain results from the configured sites.
