How to Show result of different methods with one goal

In a part of a winform application, there are different methods to achieve one goal, where users can select one or multiple ones.

Suppose this part of the application is responsible for search different search engines (different methods) for a given keyword (one goal).

My question is, what is the best way to display different search engines results for the same keyword?

Edit1:

The main requirement is to display each search engine result separately. There is no need to sort the result in any order but the results need to be compared sometimes.

Right now I have two design in my mind, First is to display each set of results in different tabs, second is to draw some kind of tree to show the result.