Profile: eveD

Problem:
Using the AND function in a search with checkboxes

Solution:
You can use the view's filter hook "wpv_filter_query" to modify view's query arguments on fly.

You can find the proposed solution in this case with the following reply:
https://toolset.com/forums/topic/using-the-and-function-in-a-search-with-checkboxes/#post-2335277

Relevant Documentation:
=> => https://toolset.com/documentation/programmer-reference/adding-custom-code/using-toolset-to-add-custom-code/
=> https://toolset.com/documentation/programmer-reference/views-filters/#wpv_filter_query