White Hart Lane is the fourth smallest pitch in the Premier League and Spurs have scored just five goals in five games at home this season.
Roberto Soldado's penalty saw off Hull City at the weekend, while Spurs had lost 3-0 at home to West Ham United in their previous home game.
Dembele acknowledged the trouble in beating some of the division's lesser lights, but he is confident manager Andre Villas-Boas will come up with a plan to win games at home.
"It's not easy for us," said Dembele in the Evening Standard. "We know that some teams are going to come here and make a block, and we don't have a big pitch so it's even more difficult.
"A small pitch makes it harder. If we have more space, it's easier for us, but we have to find a way. The manager will speak to us as well, because we always have a bit of difficulty with these kinds of teams.
"We've spoken about it, and everyone was saying 'wow, it's unbelievable - everybody is playing like this against us'. But it's not only us, because these kinds of sides do it against all the top teams.
"It's maybe a bit easier for us when teams try to attack us. It was a similar situation last year in games like this. We hardly ever win them comfortably, but we have a lot of quality in the squad, so there must be a way to find it and I think we will."
I thought that the pitches all had to be the same size this season?- elkieno