OS PDF Indexer is a Joomla extension to allow indexing and searching base on content of pdf documents of your Joomla site.
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EB Ajax Search1.16 
EB Ajax Search is an AJAX powered LIVE search (Hikashop, Virtuemart, SP Page Builder, and K2 Compatible) module that will boost user experience by providing a user-friendly ajax
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EB Ajax Search is an AJAX powered LIVE search (Hikashop, Virtuemart, SP Page Builder, and K2 Compatible) module that will boost user experience by providing a user-friendly ajax
...Minitek Smart Search 3.0.2 
AceSearch is a flexible and powerful Joomla Search component with an easy-to-use user interface that provides searching through all components from front-end
This is Simple Module that allows you to display a search box inside page at any module position. With this search box users can search for words or any particlular text in that page instantly
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A great replacement for standard Smart Search - Content plugin. Allows you to fully customize indexing process: exclude or include categories and articles, expand or limit indexing by archived or
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HIGH PERFORMANCE SEARCH FOR JOOMLA!
Geek Elasticsearch component is a powerful tool that can be used to improve your Joomla site's search Engine performance. A highly
Having issues with finding articles, products or text in other components? Consider using MijoSearch with AJAX Search and Relevant Search results. MijoSearch comes with great features such as:
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