You can enter any number of words - seperated by a single space. Search is always case insensitive. The combination of words will be weighted in the fulltext search.
Results are sorted by relevance. An article or news item of an earlier date may thus end up higher in the list, because it's more relevant to your query then a more recent published item.
If a word you are searching for is too generic, you may not get any results in a certain section (like News, Articles or Benny Stories). Try again with a more specific word.