results form a Data Base search are a bit different than from a site search like Google.
The Database search of power store uses the Product Name column for ordering, in Ascending order.
if you type:
gt 400
it is searching for gt OR 400
The results will be returned in ascending order, meaning numeric first, then Alphabetically from A - Z
if you type:
"gt 400"
with quotes it will search the literal string "gt 400" and the results will be displayed alphabetily in ascending order by the Product Name column.
If you wanted to force quotes around the search, you could add the following code at line 1 of the product results page:
<?php if(isset($_GET["S_ProductName"])) $_GET["S_ProductName"] = '"'.$_GET["S_ProductName"].'"'; ?>