I have a problem with AND and OR clause in SQL. Here is my query:

SELECT  
    `act1`.`name`,
    `act1`.`surname`,
    `act2`.`name`,
    `act2`.`surname`,
    `act3`.`name`,
    `act3`.`surname`
FROM 
    `videos`,
    `actors` AS act1,
    `actors` AS act2,
    `actors` AS act3
WHERE 
    `videos`.`ident` = 'somethink' 
  AND 
    (
        `act1`.`id` = `videos`.`id_actor1`
      OR 
        `act2`.`id` = `videos`.`id_actor2`
      OR
        `act3`.`id` = `videos`.`id_actor3`
    )

It returns me all variations of {name, surname}, but I want the name and surname of first exactly, second and thirth, if they exist.