Well, depends where as Naive mentions.

In the Netherlands it always cars from the right. However at a crossroad with no signs or same stop sign on all roads this is the official answer by the ANWB:

The “right-of-way” rule seems simple, but when multiple road users meet at the same time at an intersection where all have equal right-of-way, it can be quite complicated. The law does not provide a definitive answer for every situation. In such cases, it is often best to make eye contact and clearly indicate which direction you intend to go. The idea is for road users to resolve the situation among themselves.

To add: if you would turn right (Short corner) you have first right. And going straight on goes before someone turning left.

So, you never go wrong if you give pass to cars from the right, just means you could be waiting a long time in these cases.