You can use named routes:

Route::get('spiel', array('as' => 'spiel.index', 'uses' => 'SpielController@getIndex'));

//then
$u = URL::route('spiel.index', array(
  'term' => 'termb',
  'link' => 'type'
));

Or just append a query string (looks a bit ugly though):

$params = array('term' => 'termb', 'link' => 'type');
$queryString = http_build_query($params);
$u = URL::to(action('SpielController@getIndex') . '?' . $queryString);

why action do not support append params 。。。。。

In 4.2, I can easily use this :-

$params = array('term' => 'termb', 'link' => 'type');
$queryString = http_build_query($params);

URL::action('ProfileController@show', '?'.$queryString )

Not sure, about 4.1

i got this problem too after update