Solved. First I tried Pierre Buyle answer, but if you unpublish a node, it can't be propper accessed and those nodes become useless. In my case I have parent and child nodes, only child nodes (for admin purposes) are the ones to be hidden and NOT be indexed by crawlers. What I did it with page manager made a url redirect (hiding these nodes to all users but admin) with a http response according to this tuturial by http://www.wunderkraut.com/[1] and no-index nodes by crawlers is handleled by [Node no-index module][2]. This will work even if you don´t have paret-child node relationship.
 [Link to tutorial:][1]


  [1]: http://www.wunderkraut.com/content/learn-page-manager-part-2-introduction-and-more
  [2]: https://www.drupal.org/project/node_noindex