Formulate a url to show posts with both taxonomy terms

Looks like you can define the AND logical operator with the URL parameters, specifically adding the “+” between your terms like this:
url?taxonomy=term1+term2

This will ensure that only posts containing all terms listed are returned.

Example:
https://example.com/blog?food=sauce+cheese

[tax_query] => WP_Tax_Query Object
        (
        [queries] => Array
            (
                [0] => Array
                    (
                        [taxonomy] => food
                        [terms] => Array
                            (
                                [0] => sauce
                            )
                        [field] => slug
                        [operator] => IN
                        [include_children] => 1
                    )
                [1] => Array
                    (
                        [taxonomy] => food
                        [terms] => Array
                            (
                                [0] => cheese
                            )
                        [field] => slug
                        [operator] => IN
                        [include_children] => 1
                    )
            )
        [relation] => AND

Notice the relation is definitely AND between the terms.

In local testing, I can confirm the returned posts are only those that contain BOTH terms.

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