Table schema:
CREATE TABLE table_name_57 (dvd_title VARCHAR, region_1 VARCHAR, no_of_discs VARCHAR)

Question: Which DVD Title has a Region 1 of n/a and greater than 3 in No. of Discs?
SQL: SELECT dvd_title FROM table_name_57 WHERE region_1 = "n/a" AND no_of_discs > 3