Earlier this week I stumbled across a basic Boolean search string generator from a London based company called Clever Biscuit.
I wrote an AvidCareerist post about it, directed to the job seeker audience, here: Find the Hiring Manager with This Free, New Tool.
The post has everything you need to use the tool for recruiting. It's so easy to use, you don't even have to know what Boolean search is. I hope you'll take a look.