This is a search box that is suppossed to send POST data to phpBB to initiate a search.

<form action="forum/search.php?mode=results" method="POST">
I have looked at the source code for phpBB and it seems i have this section correct. As well as the input for keywords:

<input name="search_keywords" type="text" value="">
The only problem is that phpBB wont return any results to the search. It always responds "No topics or posts met your search criteria".

However if i use the search function through phpBB itself it does return results...

Is there something important i should add?