Ajax search pro is the best live search engine plugin for WordPress. Highly customizable, with many features and options, giving the best results possible! Replace the WordPress search bar with a better looking, more efficient search engine.
Looking for a better WordPress search? Check out this search plugins features, including checkbox, dropdown, radio button category filters and custom field (post meta) filters as well.
Ajax Search Pro for WordPress – A Live WordPress search and filter plugin
Ajax Search Pro for WordPress was designed to boost the user search experience to the maximum. It provides a live ajax search, which makes the wordpress search experience more confortable.The results are presented with images (if any found), so they look more attractive and less flat. The search works with mobile devices, let it be Android or IOS powered.
The search can override the default wordpress search results – so the ajax functionality is extended – replace your default theme search with only a click of a button.
The search can return posts, pages, any custom post types (like WooCommerce products, BBPress forums, topics, replies), categories, custom taxonomy terms (like product categories, portfolio tags), users, BudddyPress groups and BuddyPress activities as results.
Searching media attachments, including their content is also possible – for PDF, CSV, TXT, RTF and Office documents, Excel and Powerpoint files.
info: http://codecanyon.net/item/ajax-search-pro-for-wordpress-live-search-plugin/3357410