This is customize you search form to full screen search box.
Plugin Tag: custom search
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WP Full Screen Search
This plugin converts default WordPress search to full screen search overlay form on your WordPress website.
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Post Meta Searcher
When activated, forces any WordPress Search Query to query against post meta data as part of the search criteria.
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Site Search 360
Precise and fast search, autocompletion, and search suggestions for your WordPress page.
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Swiftype Site Search Plugin for WordPress
Fast, intelligent, and fully customizable search for your site.