I configured separatorsToIndex but my search is not returning the results

When your search relevance is not working as expected, you may check your searchable attributes setting - Having too many searchable attributes can impact the relevance. We would recommend reviewing your searchable attributes and select attributes that are useful for searching.

When you reduce the number of your searchable attributes, your search with the special characters should work as expected. Here's more information about Selecting Searchable Attributes.