path ?q= issue

When 'clean urls' are disabled in Drupal, what means all pathes
look like /?q=node/x, the q from the internal Drupal url is included
in the search. For example trying to access ?q=not/found the
module performs a seach for 'q not found', but it should search
for 'not found' only. At the moment (nearly) every search fail,
because q is not in the node titles in most cases.
(With clean url enabled all works fine). Thanks.