If u want to make an AND search instead of OR, you will need to rewrite the class
at this location in magento v18.104.22.168.
Now Go to the following function in this file
public function prepareResult($object, $queryText, $query)
You have to change the following line
$likeCond = '(' . join(' OR ', $like) . ')';
$likeCond = '(' . join(' AND ', $like) . ')';
Now change the Search Type to “LIKE” from catalog search section in admin.
Now reindex the search index afterwards to have an effect..