title: Get Vocabulary Categories for specific document/article in Liferay
body: <p>I'm new in Liferay, and I'm trying to get the Categories of a Specific Vocabulary for a document published in Liferay.
  i.e.
  The vocabulary is "Languages" and the Categories are : Italian, Spanish, German, English....</p>
  
  <p>I've been trying to use AssetVocabularyServiceUtil and AssetCateogiresServiceUtil, but it seems that I can only get "all" the categories or vocabularies for a specific GroupID or CompanyID for example. </p>
  
  <p>As there are several Documents published, I want to retrieve the Categories for "Languages" vocabulary of each.</p>
  
  <p>I hope you can guide me.</p>
  
  <p>******EDIT*****
  to add more details, I have a faceted search that retrieves all the documents of a specific structure, so for each of them (document) I'd like to retrieve their Categories</p>
  
  <p>Thanks!</p>