You need to remove line 9 which is the include for the old Data Assist search include file:
to troubleshot why the search is not returning any results I will need a link to the search page to test the search.
also if you could add the following code on the results page just after the <body> tag to display the search SQL, that would be helpfull:
<?php echo("SQL: ".$query_limit_WADAmembers."<br />"); ?>