title: Query for using more than 1 value in array
body: <p>I want to search documents that have certain keywords, for example:</p>
  
  <pre><code>{ "_id" : { "$oid" : "592779d4e4b027e032c585ec"} , "url" : "http:/test.com/" , "keywords" : [ "pp" , "ww" , "dd" , "f"]}
  
  { "_id" : { "$oid" : "42127741d42142142c585ec"} , "url" : "http:/taa.com/" , "keywords" : [ "qq" , "aa" , "dd" , "e"]}
  </code></pre>
  
  <p>How can I do a query so that when I search "qq+dd" only document B is returned? Right now, it returns both documents.</p>
  
  <p>Thank you</p>