Angular 1.5: invoke method in deep child directive from parent directive

Question

I have several nested directives. I now need to invoke a function in deep child.

<parent-directive>
    <child-directive>
        <deep-child-directive></deep-child-directive>
    </child-directive>
</parent-directive>

I want call method in deep-child-directive controller from parent-directive controller. Is there any way except $broadcast to do this?

my function:

$scope.refreshProductSearch = function() {
    var isRefresh = true;
    if( $rootScope.urlOption.query  ) {
        var selected = $rootScope.urlOption.query;
        if( $rootScope.urlOption.query) {
            var urlOption = util.jsonUrlParser(selected);
            isRefresh = urlOption.query.searchs ? false : true;
        }
    }
    if( isRefresh ) {
        $scope.clearValues();
    }
    $scope.$emit("removeAdvanceSearch");
};