What's a broad keyword search?
 

What exactly is a broad keyword search? I'm useing google keyword tool and none of their results ever go over 3 or 4 words long no matter what I put in.

a broad match is the query without quotes.
a phrase match is the query with quotes.
a 3 or 4 word query is a long tail keyword, which can be broad or phrase match.

You need different sources of data to get really good long tail keywords, the standard Google keyword tool doesn't cut it.

free porn - broad search, includes anything with keywords free and porn
"free porn" - the phrase is found like this followed by other words around it