Think of a 4 selection wager that consists of 11 bets namely 6 doubles, 4 trebles and a four-fold accumulator. Sounds complicated, right? Actually I've heard that it is possible to recoup your money even if not all selections are winners.
I may not know much about Yankee bets but I have heard of 'Super Yankee' betting which is a wager on 5 selections consisting of 26 bets. I'm not sure if it is easy to win a huge amount in this way.