Show sub category result after selecting a parent category

[Hay]

Hi,
Still have the same issue.
By the way, the following topic has already identified the issue but it did not get any answer.

Listing search form doesn't show subcategories

The listing search form only displays the categories and doesn’t show the subcategories. i want it to show both subcategories and keywords. and also bring out anything related to the item the user searches for on the search form. for example if a user searches for Table and its not a listing category or subcategory but it’s a keyword in a title or header to a listing i want it to come up