you could change the line in the files that is:
Code:
if(empty($and))$and = "OR";
$substring_query = (!empty($con)) ? " AND (".join(" ".$and." ",$con).") " :" 1 ";
to
Code:
if(empty($and))$and = "AND";
$substring_query = (!empty($con)) ? " AND (".join(" ".$and." ",$con).") " :" 1 ";
That will mean that both words have to be present to return the results and will work out far more accurate for your purposes.