Write a function `find_combinations` that takes a list of tuples, where each tuple contains two integers. The function should return a list of tuples, where each tuple represents the sum of corresponding elements from all possible pairs of tuples in the input list.
#### Example Usage
```python [main.nopy]
find_combinations([(2, 4), (6, 7), (5, 1), (6, 10)])
# Expected output: [(8, 11), (7, 5), (8, 14), (11, 8), (12, 17), (11, 11)]
find_combinations([(3, 5), (7, 8), (6, 2), (7, 11)])
# Expected output: [(10, 13), (9, 7), (10, 16), (13, 10), (14, 19), (13, 13)]
```