CODE EXAMPLE FOR PHP

checnge message no products were found matching your selection woocommerce edit

add_action( 'woocommerce_no_products_found', function(){
    remove_action( 'woocommerce_no_products_found', 'wc_no_products_found', 10 );

    // HERE change your message below
    $message = __( 'No products were found matching your selection.', 'woocommerce' );

    echo '<p class="woocommerce-info">' . $message .'</p>';
}, 9 );