jeremypreed

Improved Search is a AJAX search interface you can place anywhere on your WordPress site and get instant search results as soon as you beginning typing. Improved Search delivers the most relevant results first. It also separates results by post type to help you quickly identify the post you are trying to find. Improved search allows you to customize the experience to fit the needs of your WordPress site. Improved Search comes with a shortcode as well as a widget for you to control its location.

Improved Quick Search

Improved Search is a AJAX search interface you can place anywhere on your site and get instant search results as soon as you beginning typing.

Sandesh

Lightweight Live Ajax Search plugin enables AJAX powered live search. Lightweight and provides a shortcode to display live search input box anywhere. You can place a shortcode wherever you want. Fully optimized and easy to use plugin.
<h3>How to use?</h3>
** Replace theme’s search form **
If you want to replace them’s search form, then it is a plug and play feature.
<ol>
<li>Go to Setings->Live Search</li>
<li>Enable Replace Theme’s Search Form option</li>
<li>Select the post types you want to allow for a search</li>
<li>Save it.</li>
</ol>
All instance of your theme’s search will replace with Live Ajax Search
** Use shortcode ** 
In some cases, if you do not want to replace theme’s search form, copy the shortcode and paste it anywhere you want. You have full flexibility on it.
<ol>
<li>Go to Setings->Live Search</li>
<li>Disable Replace Theme’s Search Form option</li>
<li>Select the post types you want to allow for a search</li>
<li>Save and Then Copy the shortcode and place it anywhere you want.</li>
</ol>

Lightweight Live Ajax Search

Live Ajax based search functionality. Lightweight and provides a shortcode to display live search input box anywhere.

Improved Quick Search vs Lightweight Live Ajax Search