CREATE TABLE table_74770 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Who is the away side at corio oval?
SELECT "Away team" FROM table_74770 WHERE "Venue" = 'corio oval'
SELECT "Away team" FROM "table_74770" WHERE "Venue" = 'corio oval'