The search excerpt plugin greatly improves the standard search feature with wordpress.
We use this plugin with our content management solution and all our blogs.
Instead of just returning search results showing the page title and the standard post excerpt (which may not contain the search term), this plugin, search excerpt, displays the search term highlighted (like so) and the text before and after the search term.
So your searches will show you exactly where the search term was found and you will know if that is the right context you are looking for.
Programmers website: Search Excerpt WordPress Plugin