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Change the number of accepted search terms for a specific SearchWP supplemental engine
function my_searchwp_max_search_terms_my_engine( $num_terms) {
return 10; // allow 10 search terms for 'My Engine'
add_filter( 'searchwp_max_search_terms_my_engine', 'my_searchwp_max_search_terms_my_engine' );
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