The Giants were staring at a second consecutive home defeat when they trailed 10-6 early in the second half but finished the stronger side at the John Smith's Stadium to claim a sixth win in seven attempts.
Anderson said: "We're just looking at trying to grind some wins out. You don't win anything at this time of the year. We're finding ways to win games at the moment. There is a lot of improvement in us."
He added: "We weren't the most cohesive. It was a real tough game. Both teams came prepared to trade sets in the arm wrestle.
"I thought Hull had the better field position and more attacking kicks but I can't fault our collective resolve to find something special to beat a good team.
"The scoreline probably blew out a bit at the end.
"As a spectacle it was probably not the best but it was real physical, that's rugby league."
Hull went into the game without three members of the side that demolished Castleford 52-0 and coach Peter Gentle admitted training had been disrupted by injury and illness.
"Six players had fitness tests, five passed and one didn't," he said. "I was very pleased with our effort, although our execution left something to be desired at times.
"We didn't give ourselves a chance in the first half - we were a bit shellshocked - but we looked dangerous when we got into the game and, with a bit of luck, we could have got closer or even got a win."
- Sports & Recreation