When I talk about search strategies in my workshops I stress the importance of getting students to utilize more than just the default Google.com search engine. One of the ways to do that is to introduce students to resources like the Google News Newspaper archive. In the Google News Newspaper archive you can search for a specific newspaper, search for article titles, or as demonstrated below you can search for a topic.
This is one of the resources that we will explore during my presentation Teaching With Technology and Primary Sources next week at #NCTIES15 in North Carolina.