The followings are key words that helps narrow your research when using a search engine
or, not, and Would be the answer your looking for
I feel like it would be easy to use these key words or phrases or to use the advanced search option in many search engines so it can do it for you. Google for example will have you fill out the form then put what it is you need in the search window. I did one on the Gold Rush...
Gold Rush California OR 1849 OR "Sutter's Mill" -.edu
...Notice they used OR, so maybe that's the way to go.