public function save()
    {
        $operations = [];

        $this->items->each(function ($item) use(&$operations) {
          $operation = $this->setOperator();
          $operation->setOperand($item);
          $operation->setOperator('SET');

          $operations[] = $operation;
        });

        if(empty($operations))
            return false;

        return $this->adWordsServices->mutate($operations)->getValue();
    }