Someone

if (arg(1) != '' && arg(2) != '' && arg(3) != '' && arg(4) != '' && arg(5) != '') {
		$query = "SELECT
			{node}.nid,
			{node}.title
			FROM
			{node} ";
		
		$where = array();
		$joins = array();
		
		switch (TRUE){
			case (arg(1) != '-1' && arg(2) == '-1'):
				$child = taxonomy_get_children(intval(arg(1)));
				foreach ($child as $childo){
					$children[]=$childo->tid;
				}
				$child = implode(",",$children);
				$where[] = " {term_node}.tid IN ('".$child."')";
				$joins[0] = "Inner Join {term_node} ON {node}.nid = {term_node}.nid";
				break;
				
			case (arg(1) != '-1' && arg(2) != '-1'):
				$where[] = " {term_node}.tid =  '".intval(arg(2))."'";
				$joins[0] = "Inner Join {term_node} ON {node}.nid = {term_node}.nid";
				break;
				
			case (arg(3) != '-1'):
				$where[] = " {content_type_cars}.field_year_value = '".intval(arg(3))."'";
				$joins[1] = "Inner Join {content_type_cars} ON {node}.nid = {content_type_cars}.nid";
				break;
				
			case (arg(4) != '-1'):
				$where[] = " {content_type_cars}.field_type_value = '".intval(arg(4))."'";
				$joins[1] = "Inner Join {content_type_cars} ON {node}.nid = {content_type_cars}.nid";
				break;
				
			case (arg(5) != '-1'):
				$where[] = " {content_type_cars}.field_enigne_size_value = '".intval(arg(5))."'";
				$joins[1] = "Inner Join {content_type_cars} ON {node}.nid = {content_type_cars}.nid";
				break;
		}
		
		$output .= drupal_get_form('_find_cars_search_lalblock_advanced_form')." Advanced car Search";
	}
	$joins = implode(" ", $joins);
	$where = implode(" AND ", $where);
	$query .= $joins;
	$query .= $where;
	
	print($query);