The Bulgarian striker believes part of the problem stems from the fact so many teams are raising their game against the leaders.
United suffered their third away league defeat on Sunday when they lost 3-1 at Liverpool, yet at home, Sir Alex Ferguson's side have been invincible with 40 points taken out of a possible 42.
"We haven't won as many games as we should have away from home, but that's not because we haven't tried to," he told the club`s official website. "We never go into a game looking for a draw or thinking we'd be happy with a point. We aim to win each game.
"The difficulty is that other teams lift their game when they play Manchester United. We're the biggest club, so it's only natural. I understand that. That makes our job harder, but that's not an excuse: we need to be better away from home.
"At Old Trafford, we're doing really well. We're entertaining the fans, we're scoring a lot of goals. The aim is to bring that to our away performances."
Source: PA
Source: PA