Multiple Keyword in search

Do I have to duplicate the same input into two different variables?

PHP Code:

$keyword = explode(' ', $this->request->getVar('key'));
$keyword2 = explode(' ', $this->request->getVar('key'));

$builder = $this->db->table('test');
$builder->like('bio', $keyword);
$builder->orLike('first_name', $keyword);
$builder->orLike('last_name', $keyword);
$builder->orLike('bio', $keyword2);
$builder->orLike('first_name', $keyword2);
$builder->orLike('last_name', $keyword2);
$query = $builder->get();

$q = $query->getResultArray();