protected function getSearchParameter()
{
if (strpos($this->search, '+')) {
$words = preg_split('/[\\s\\+]+/', $this->search);
return '%' . implode('% && %', $words) . '%';
} else {
$words = explode(' ', $this->search);
return '%' . implode('% || %', $words) . '%';
}
}