Magento 2.x Search Refinement
Transform Magento2's out of the box search behavior to 'Refinement' when searching with multiple terms.
This free extension changes the search results behaviour of Magento 2.x to show a more restrictive result set than the one that is available out of the box. Search changes from default 'OR' to 'AND' when using a search phrase with multiple words.
See more details here: https://extensions.activo.com/catalog-search-refinement.html
Another great extension by Activo Extensions!