Had fulfilled following prerequisites of the Drupal 7's built in search to work:
Result: 100% of the site has been indexed. There are 0 items left to index.
Issue: The strange behavior is when I search the relevant text (which I'm sure is available), unfortunately got following message every time: 'Your search yielded no results.'
Any idea why the search is not pulling relevant data?
You may need to check your user permissions to ensure that it is enabled to be used and viewed whoever you configure to have access to it.
Hope this helps.
Steps to use if you have content on your site and are using the drupal built-in search and not getting any results:
http://www.w3courses.com/drupal-search-not-working-and-does-not-return-any-results