protected function getSearchParameter()
    {
        if (strpos($this->search, '+')) {
            $words = preg_split('/[\s\+]+/', $this->search);

            return '%' . implode('% && %', $words) . '%';
        }
        $words = explode(' ', $this->search);

        return '%' . implode('% || %', $words) . '%';
    }