How to enque multiple webfonts in wordpress?

I downloaded some blank wordpress-theme files and started filling them with own php, html and css.
I used the following code to enque a google webfont:

    function load_fonts() {
            wp_register_style('googleFonts', 'http://fonts.googleapis.com/css?family=Tauri');
            wp_enqueue_style( 'googleFonts');
        }

 add_action('wp_print_styles', 'load_fonts'); 

But I would like to add another webfont. I tried two things:

1: Adding it in the wp_register_style with a ‘,’

function load_fonts() {
            wp_register_style('googleFonts', 'http://fonts.googleapis.com/css?family=Tauri','http://fonts.googleapis.com/css?family=Muli');
            wp_enqueue_style( 'googleFonts');
        }

 add_action('wp_print_styles', 'load_fonts'); 

2: Duplicate:

    function load_fonts2() {
            wp_register_style('googleFonts2', 'http://fonts.googleapis.com/css?family=Muli');
            wp_enqueue_style( 'googleFonts2');
        }

 add_action('wp_print_styles', 'load_fonts2'); 

Unfortunately both ways didn’t work. Can anybody tell me why the ways above don’t work,
and how I can add multiple webfonts.
Thank you in advance!

Credits