More word query returned no results

The LIKE query found no results for more words, also if a
page like that exists. To prevent this the entered string is spilt up
after each whitespace and insert a LIKE operator.

 * Improved query a little
 * Removed leagcy code which was from the time when PrefixSearch was used

Change-Id: I3bcb0d0f84b3d5411f43121025610569514b3a46
Merge "More word query returned no results"