function ajax_search() {
                    if ( ! apply_filters( 'woosc_disable_nonce_check', false, 'search' ) ) {
                        if ( ! isset( $_POST['nonce'] ) || ! wp_verify_nonce( sanitize_key( $_POST['nonce'] ), 'woosc-security' ) ) {
                            die( 'Permissions check failed!' );
                        }
                    }
                
                    $keyword  = sanitize_text_field( $_POST['keyword'] ?? '' );
                    $products = self::get_products();
                    global $wpdb;
                
                    $args = [
                        'post_type'           => 'product',
                        'post_status'         => 'publish',
                        'posts_per_page'      => self::get_setting( 'search_count', 10 ),
                        'fields'              => 'ids',
                        'ignore_sticky_posts' => 1,
                        'orderby'             => 'menu_order title',
                        'order'               => 'ASC',
                    ];
                
                    // Exclude already compared products
                    if ( ! empty( $products ) ) {
                        $args['post__not_in'] = $products;
                    }
                
                    // Add filters for WHERE, JOIN, GROUPBY
                    add_filter( 'posts_where', function ( $where ) use ( $keyword ) {
                        global $wpdb;
                        if ( empty( $keyword ) ) return $where;
                
                        $like = '%' . $wpdb->esc_like( $keyword ) . '%';
                
                        $where .= $wpdb->prepare("
                            AND (
                                {$wpdb->posts}.post_title LIKE %s
                                OR woosc_sku_meta.meta_value LIKE %s
                                OR {$wpdb->posts}.ID IN (
                                    SELECT tr.object_id
                                    FROM {$wpdb->term_relationships} tr
                                    INNER JOIN {$wpdb->term_taxonomy} tt ON tr.term_taxonomy_id = tt.term_taxonomy_id
                                    INNER JOIN {$wpdb->terms} t ON t.term_id = tt.term_id
                                    WHERE tt.taxonomy IN ('product_cat','product_tag')
                                    AND t.name LIKE %s
                                )
                            )
                        ", $like, $like, $like );
                
                        return $where;
                    });
                
                    add_filter( 'posts_join', function ( $join ) {
                        global $wpdb;
                
                        if ( defined( 'DOING_AJAX' ) && DOING_AJAX && isset( $_POST['keyword'] ) ) {
                            $join .= " LEFT JOIN {$wpdb->postmeta} AS woosc_sku_meta
                                       ON ({$wpdb->posts}.ID = woosc_sku_meta.post_id
                                       AND woosc_sku_meta.meta_key = '_sku')";
                        }
                
                        return $join;
                    });
                
                    add_filter( 'posts_groupby', function ( $groupby ) {
                        global $wpdb;
                        return "{$wpdb->posts}.ID";
                    });
                
                    // Run search query
                    $query = new WP_Query( $args );
                
                    // Output results
                    if ( $query->have_posts() ) {
                        echo '<ul>';
                
                        foreach ( $query->posts as $pid ) {
                            $pr = wc_get_product( $pid );
                
                            if ( apply_filters( 'woosc_search_exclude', false, $pr, $products ) ) {
                                continue;
                            }
                
                            echo '<li><div class="item-inner">';
                            echo '<div class="item-image">' . $pr->get_image( 'woosc-small' ) . '</div>';
                            echo '<div class="item-name">' . esc_html( $pr->get_name() ) . '</div>';
                            echo '<div class="item-add woosc-item-add" data-id="' . esc_attr( $pid ) . '"><span>+</span></div>';
                            echo '</div></li>';
                        }
                
                        echo '</ul>';
                    } else {
                        echo '<ul><span>No results found for "' . esc_html( $keyword ) . '"</span></ul>';
                    }
                
                    wp_die();
                }