Not a specific word or phrase, but Google Dorking is useful for limiting down search results. Just the basics of putting things in double quotes (e.g. "Find this exact text") and negating words/phrases (e.g. -NotThis) can go a long way in refining search results. The "filetype:" modifier is much less useful than it was a decade or two ago, as SEO assholes have gotten wise to it and so include tags to show up on results using it. The "site:" keyword can be really handy, when you are pretty sure what you want is on a specific site/domain. Or, if you are trawling a website for specific information. You can also negate the "site:" keyword. So, you can add something like "-site:expertsexchange.com" to a search and get rid of useless advertising sites.