Search for Entity that has multiple tags in doctrine

I have a many to many relation between Document and Tag. So a Document can have several Tags's, and one Tag can be assigned to different Document's.

This is Tag

AppBundle\Entity\Tag:
    type: entity
    table: tags
    repositoryClass: AppBundle\Repository\TagRepository
    manyToMany:
        documents:
          targetEntity: Document
          mappedBy: tags
    id:
        id:
            type: integer
            id: true
            generator:
                strategy: AUTO
    fields:
        label:
            type: string
            length: 255
            unique: true

And Document

AppBundle\Entity\Document:
type: entity
table: documents
repositoryClass: AppBundle\Repository\DocumentRepository

manyToMany:
    tags:
      targetEntity: Tag
      inversedBy: documents
      joinTable:
          name: documents_tags
id:
    id:
        type: integer
        id: true
        generator:
            strategy: AUTO
fields:
    title:
        type: string
        length: 255

Now I want to search for all Documents that has the tags animal and fiction. How can I achieve that with doctrine?

Something like

$repository = $this->getDoctrine()->getRepository('AppBundle:Document');
$query = $repository->createQueryBuilder('d');
$query  ->join('d.tags', 't')
                ->where($query->expr()->orX(
                            $query->expr()->eq('t.label', ':tag'),
                            $query->expr()->eq('t.label', ':tag2')
                        ))
                ->setParameter('tag', $tag) 
                ->setParameter('tag2', $tag2)

wont do the job, because it returns all Documents that have either tag1 or tag2. But andX won't work too, because there is no single tag that has both labels.