[spence]

I am new to X-Cart so take this with a grain of salt. In the admin area under general settings there is an option for this I think.

Allow searching by individual words of a search phrase:

In search.php I see an If statement that says the same thing. More than likely this is the toggle in the admin area.

if ($config['General']['allow_search_by_words'] == 'Y')
$allowable_search_fields[] = 'including';