You're seeing just the function naive_search_params, go back to Forage.Search module for more information.
Link to this function

naive_search_params(params, field)

Convert a search term into params that can be used in a forage plan. Search will be case-insensitive.

This is implemented internally as an ILIKE operator. By default, the ILIKE operator doesn't ignore accents. If you want to ignore accents, you need to use unaccented_search_params/2 and prepare a special column in your database (see here).

If it makes sense for your application, you can implement better search yourself.