How to trigger one subscription for 2 different events ?

A subscription can be triggered by only one event, as you probably have seen this already.

If your requirement is literally to trigger a single subscription for 2 events, you can not do this.

However, I doubt that this is really needed, and you can simply use an additional service which contains the code of the original subscription, then create 2 subscriptions, each for one event, and in the subscription simply call the service you designed earlier. There are other ways to do this, but they don't make too much sense  or add too much complexity (creating custom events etc.)