Hello,
Joomla 3.3.3
BookLibrary 3.0 Free
Meanwhile I found and corrected the bug myself by comparing BooklibrarySearch.php to an original joomla plugin.
After changing
$word= $db->Quote( '%'.$db->getEscaped( $word, true ).'%', false );
to
$word= $db->Quote( '%'.$db->escape( $word, true ).'%', false );
the search worked fine.
Regards,
HH