I’ve never really paid attention to the “also try” feature in Yahoo!, which allows you to see related keyword. Each time you run a search in Yahoo!, they display a short list of related keywords, that you can expand by clicking on “more”, then “show all” to see the complete list of related keywords.
I wish I used this feature before, because I have to say that it’s pretty useful if you’re running a keyword research. It can help you find related keywords that you may not have found with other keyword tools.

Apparently, they only display keywords that are popular enough, you can use Overture to verify the popularity of each keyword. One other good thing is that it makes the difference between plurals and singulars.

See the example below for the term “internal audit“: