Using OR when searching

I would like to search to find documents whose titles contain one word or phrase or another. For example, searching to find Dell Computers or E510 or both. How would I do this?
Jim

What kind of documents; MS Word, plain text, HTML or something else?

From your answer, I realize I didn't state my problem clearly. I wanted to search for file names, not documents that contain certain words.
Thanks, Jim

In the Find panel, use a wildcard like this:

(Dell Computers|E510)