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I am trying to fetch all posts which has been tagged with particulars tags.here is code i am trying to use

$args=array(  
    'tag_slug__and' => $categories_array,
    'posts_per_page'=>10, // Number of related posts to display.  
    'caller_get_posts'=>1  
);

I also tried this way

$args=array(  
    'tag_slug__and' => array('hill-station','honeymoon'),
    'posts_per_page'=>10, // Number of related posts to display.  
    'caller_get_posts'=>1  
);

$query = new wp_query( $args );

I have cross checked my data and there are 2 posts which have tags 'hill-station','honeymoon' beside others, but $query has no result.

if I use only one value under tag_slug__and like hill-station or honeymoon, i am able to see results.

Is there something i am doing wrong here or i have misunderstood the way tag_slug__and work in wordpress

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