They don't. The simply give the mark (the recipient of the fortune) the impression that his or her fortune is being controlled by the dice which are being controlled by some magical mysterious power when, in reality, the seer (the teller of the fortune) is simply using the tricks of the trade to read the mark and say something that is either general knowledge or learned elsewhere. They also play into the lack of knowledge of the mark, such as the fact that the most probable outcome of the roll of a pair of dice is a seven, and that's not even counting what you can do with a loaded pair of dice.
Don't get me wrong. I'm not denying the existence of psychics and psychic phenomenon. There just happen to be a lot more, and I mean a really lot more, con artists out there, and some of them are really good at their trade, which is simply and only to divest you of your money.
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There are 9 odd sums that you can get from rolling two dice.
none
If its a fair dice 1/6
1 in 6.
rolling 8 on a 6 sided dice? in a single roll? approximately 0. on a 12 sided dice? one in 12. two six sided dice? 5/36