I have heard a lot of WordPress users complaining about the lack of possibilities in the WordPress built-in search. If you ever wished to provide your readers a full text search, wildcards, and even text highlighting across posts, this plugin is for you.
You can grab the Search Unleashed plugin at http://urbangiraffe.com/plugins/search-unleashed/. Next, simply install it according to the standard plugin installation procedure described earlier.
Once the plugin is installed successfully, you'll be able to customize its option on a Search Unleashed page located under Manage.
There's a bit of configuration needed for the plugin to work properly:
Login to your WordPress dashboard and go to Manage | Search Unleashed.
Click on the Modules link.
Select the data that you want to be indexed by the plugin, as shown in the following screenshot.
Click on the Options link.
Configure the options to fit your needs (Page title, search...