Thank you for contacting us.
Sitefinity uses Lucene to do the search and as a result the partial search match is not done automatically. In order to do a partial search match * needs to be appended to the search term. You can easily test it on your website by searching for anat* and you will see the returned results.
However, this is not user friendly to require people to manually add the * to the search term. We will need to do it automatically behind the scenes so the users don't even notice. We are faced with 2 challenges:
Please, find attached the sample widgets. Add them to your project, use Thunder to register them and use them instead of the default ones and test the functionality on a backup of your project.
As part of the match the correct character is required. "I"with accent is not the same as i.
Hopefully they will be the solution for your requirement.