Change the number of accepted search terms for SearchWP supplemental engines

gistfile1.php

<?php

function my_searchwp_max_search_terms_supplemental( $num_terms) {
	return 10; // allow 10 search terms for supplemental engines
}

add_filter( 'searchwp_max_search_terms_supplemental', 'my_searchwp_max_search_terms_supplemental' );