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By default, Relevanssi removes parentheses, leaving you with “1”, and that’s too short as the minimum word length is 3.

To keep the parentheses, add this to your theme functions.php and rebuild the index:

add_filter('relevanssi_remove_punctuation', function($a) {
	$a = str_replace( '(', 'OPENINGPARENT', $a );
	$a = str_replace( ')', 'CLOSINGPARENT', $a );
	return $a;
}, 9 );
 
add_filter('relevanssi_remove_punctuation', function($a) {
	$a = str_replace('OPENINGPARENT', '(', $a);
	$a = str_replace('CLOSINGPARENT', ')', $a);
	return $a;
}, 11 );