query_posts is not working for search loop

I am trying to get custom results of search request , I need to get posts with some ID and cat ID , like this:

$args = array(
   'cat' =>  20,
   'post__in'  => array( 23, 45, 45, .. )
);
query_posts($args);
if (have_posts()) : while (have_posts()) : the_post(); ......

But it returns all posts in Category ID “20”.
Who can help me , please