[PHP] Search a word in multiple tables

[Phpu]

Hi,
How can i search a specific word in 2 tables
I use this but it is not working

sql = "SELECT a.product_id, a.".select_language('product_name_en', 
'product_name_fr').", b.brand_name FROM products_accessories as a, brands as b 
         WHERE (a.".select_language('product_name_en', 'product_name_fr')." LIKE 
'%".$word."%'  OR b.brand_name LIKE '%".$word."%')";
$result= mysql_query($sql);

Thanks