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Plugins: Google Custom Search
What it is: This plugin uses the power of Google to search the contents on your wordpress site.
The search results can be displayed in one of three formats:
- As a pop-up resizable dialog.
- Within the widget, under the search box.
- Displayed anywhere in the code (php and wordpress theme familiarity required to do this).
More info: https://wordpress.org/plugins/google-custom-search/