Customize Search Meta Query ? Challenge for real WordPress Guru

Hi guys,
I’ve been in a stumbling block for long. Now I would like to ask expert like you that.

I would like to customize my Search to search only in a specific meta_key and meta_value and return posts or post->ID.

Here what my dbase wp_postmeta looks like.

meta_id    post_id    meta_key       meta_value
1             5      numero_dispo    10, 20, 63
2             8      numero_dispo    25, 42, 10
3             1      numero_dispo    15, 54, 48
4             3      numero_dispo    20, 78, 27

I would to have the post->ID for i.e that search: 20 (space) 10 (space) 63 or 20+10+63

And would like to my search to return where it finds all the number and where it finds for each number.

In this case:
post #5 (first)
post # 8
post# 3.

The closer I have gone, is that:

if ( $_GET["s"]!='Search') {
	$key_1_value=$_GET["s"];
	$exploded = explode(' ', $key_1_value);

	ksort($exploded, SORT_NUMERIC);
foreach ($exploded as $key => $val) {
	$arg =array('numberposts' => $number, 'post_type'=>$post_type, 'meta_query' => array(
		array(
			'key' => 'numero_dispo',
			'value' => $val,
			'compare' => 'LIKE',
		)
	));

But it wasn’t good:
#1 That checks value one by one not in group.
#2 He returns post ID for each time it finds the a value in it.
i.e: Post #5 will display 3 times.

Any help please.