Answer from Richard M on the [question originally asked on StackOverflow][1]:

Replacing line 21 on [search.php][2] with `$search_query[$query_split[0]] = urldecode($query_split[1])` resolved it.


  [1]: http://stackoverflow.com/questions/6819226/search-results-not-displaying-for-multiple-word-search-in-wordpress
  [2]: http://pastebin.com/tjGsDePY