It is not possible to write two odd numbers that total an even number like 12. The sum of two odd numbers is always even, but since you need an even number, there are no two odd numbers that can sum to 12. For example, the sum of 3 and 9 (both odd) equals 12, but if you attempt another combination, you'll find that all pairs of odd numbers result in an even sum.
If you are looking for two numbers that sum to 12, one must be even and the other must be odd. An example is 7 (odd) and 5 (odd), which total 12, but this combination doesn't meet the criteria you've given.