CREATE TABLE table_15506 ("Country" CLOB, "Film title used in nomination" CLOB, "Language" CLOB, "Original name" CLOB, "Director" CLOB)

Name the original name for the one from bulgaria
SELECT "Original name" FROM table_15506 WHERE "Country" = 'bulgaria'
SELECT "Original name" FROM "table_15506" WHERE "Country" = 'bulgaria'