SELECT 
	terminal_id 
FROM bg_person_answer 

WHERE   
	( question_id = 1 AND answer_id = 1 ) 

OR

	( question_id = 2 AND answer_id = 5 )


SELECT a.terminal_id 
FROM bg_person_answer a, bg_person_answer b

WHERE 
       a.terminal_id=b.terminal_id 
AND
      ( a.question_id = 1 AND a.answer_id = 1) 
AND
      ( b.question_id = 2 AND b.answer_id = 5 )