not query string &

[eluser]nhantam[/eluser]
When I search my web
Example

Search:
SELECT * FROM products WHERE (productName LIKE "%Coton & Size%") LIMIT 0,20
result = 0;
If I search: productName LIKE "%Coton Size%"
result = 1


But when I search on http://localhost/phpmyadmin
SELECT * FROM products WHERE (productName LIKE "%Coton & Size%") LIMIT 0,20
result = 1

Please check character & in query string

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my code:
$sql = 'SELECT * FROM products WHERE (productName LIKE "%Coton & Size%") LIMIT 0,20';
$query = $this->db->query($sql);