Is possible to use multiple taxonomy terms name (not tids) as contextual filter in Views?
Maybe too late for this to matter, but you may be able to do this with hook_views_pre_view().

Possible example:

function MYMODULE_views_pre_view(&amp;$view, &amp;$display_id, &amp;$args) {
  if (!empty($args)) {
    // change the argument to term IDs
    $term_names = explode('+', $args[0]);
    foreach ($term_names as $term) {
      $terms[] = taxonomy_get_term_by_name($term)-&gt;tid;
    }
    $view-&gt;args[0] = implode('+', $terms);
  }
}