How to enable Did you mean feature in Adobe Search and Promote | Enable Guided Suggestions in Adobe Search and Promote
This tutorial explains the details on “Did You Mean” feature in Adobe Search and Promote.
You can configure “Did You Mean” so that customers are given suggestions for valid search terms when they have tried searches that have failed. Suggestions are formed by looking for spelling and typing corrections to the search terms that result in a valid search.
This feature helps to avoid the null search due to wrong spelling of words in the search term and improve the conversion.