Zlatan Ibrahimovic cancelled out Diafra Sakho's early opener at Old Trafford, but the hosts could not find a winner despite having numerous attempts on the West Ham goal.
The result was United's fifth draw in their last seven league matches and left them 11 points behind leaders Chelsea.
"I don't know what to say. At the moment, luck is completely against us. We are playing very good and we deserve eight more points than we have," Herrera was quoted as saying by Sky Sports.
"I don't know when the luck will change, but it's not even luck – it's just [what is] fair. We are looking for fair. We are looking to score maybe half of the chances we create and we will win 4-1 every game."
Herrera said it was a good sign that United were creating numerous chances in their matches and added that the club are bound to go on a winning run sooner rather than later.
"The best player of Burnley was the keeper, the best player of Stoke was the keeper, the best player of Arsenal was Petr Cech, the best player of West Ham was [Darren] Randolph," the Spain international said.
"We play intense, we win the second balls, we create chances, we move the ball, we control the game, we have more possession than the opponents, we shoot on goal.
"I remember last season everyone said, 'shoot, shoot, shoot', and now we shoot I don't know how many times each game but we are not scoring.
"It's unbelievable that we don't have six or eight points more than we have but hopefully the luck will turn in our favour."
United's next assignment sees them hosting West Ham in the quarter-finals of the EFL Cup at Old Trafford on 30 November.
The Red Devils travel to Merseyside to face Everton at the weekend before a trip to Ukraine to face Zorya Luhansk in the Europa League on 8 December.