Two goals in two minutes from Ryan Gravenberch and Florian Wirtz had Liverpool 2-0 ahead at halftime before Santi Bueno struck just after the break.
Van Dijk conceded afterwards: "You have to find a way to win and I think if you look at the season it's been up and down. There's been good games and unfortunately some bad games.
"Then you have to try and do everything and fight for every second on the pitch. I think you can see that, not only today, but over the last couple of games that we really want to get the wins on the board. Today was a good one."
On Wirtz getting on the scoresheet, Van Dijk added: "He's getting more used to the intensity and the way we play. He's very important on the ball and obviously his qualities there is no debate about.
"We are very pleased for him, but he should be very pleased with the goal as well. I think after 60 minutes or something he was quite tired so that's something he and we have to work on as well in order to do that every three days for 90 minutes."