Hey Ahmet; we've been working on a tool that kind of does what you need; it sounds like from your post that you want to be able to:

1. Search multiple weekends, all in one
2. Search multiple destinations (departing from Oslo)
3. Filter by time of departure

Flightbot (https://flightbot.com) definitely does 1 and 3, and kind of does 2 too (though you have to specify a couple of cities manually yourself). Take a look at the following search: https://flightbot.com/search/OSLO/LO...ReturnTime=540

Is this what you're looking for? Or is there something else we're missing?