$tax_query = array(
                                    'relation' => 'AND',
                                    array(
                                        'taxonomy' => $taxonomy,
                                        'terms' => $terms_array,
                                        'field' => 'term_id',
                                    ),
                                    array(
                                        'taxonomy' => $taxonomy,
                                        'terms' => array( 'all-countries' ),
                                        'field' => 'slug',
                                        'operator' => 'NOT IN'
                                    ),
                                );