How to change woocommerce language only without changing dashboard language?

I need to change the language of woocommerce to Vietnamese but is the WordPress admin page still in English?

I would suggest you ensure the language files and then in functions file add this code.

//set Vietnamese locale
add_filter( 'locale', function($locale) {
    if ( !is_admin() ){
        $locale = "vi";
    }
    return $locale;
});