For those unfamiliar with yahtzee, your goal is to get the best combination of 5 dice. You're given three chances to roll and on the first two chances you can choose which dice to keep and which to roll again. After your third roll you have to pick the best combination.
Yahtzee bowling is the same idea, but instead of rolling you're bowling the ball to knock down the dice.
I find the computer can be crazy hard sometimes, often getting yahtzees and four of a kind out of nowhere. There really isn't any tactic other than make sure you knock down all the pins and make sure you notice what a good combo is. There is unfortunately a lot of luck to this game, just like the original yahtzee.