City youngsters beaten by Spurs
The hosts began brightly and were unfortunate not to go in front as early as the opening minute when they struck the woodwork ahead of the converted rebound being ruled out for offside.
Having survived that scare, Spurs took a 15th minute lead through Ryan Loft - with the striker's hat-trick eventually consigning City to defeat.
Speaking after the Barclays Under-18s Premier League contest, Murty told canaries.co.uk: "I said to the players we need to be more clinical at both ends of the pitch as we started well, which makes it more disappointing.
"We played some nice stuff and I couldn't fault our bravery to get on the ball. Some of our combination play was very good but the disparity between that and other things was too big.
"It's letting the players down as the stuff they're doing well is at a very high level technically. What we're falling down at is way below what we need to see, and what the players need to produce.
"We're too easy to score against, and I'm yet to see anyone score a world-class goal against us. Sometimes you're going to be outnumbered and will have to put your body on the line in order to find a way to defend danger-zones."
Despite the result, Murty remained keen to stress the positives of the performance, and added: "I can't be too down because what we did well was good.
"For example, I thought Jamal Lewis was a plus point as he produced great end-product and caused them problems. We need to find a way to turn outlets like that into a direct goal-threat.
"We need to build a more consistent attacking threat, rather than relying on players having to do something outstanding. It's also important we ensure other parts of our game are closer to the level of the things we're doing well.
"Some of our middle-third play was excellent, and perhaps we just need to take a few more risks in that area to help create something further up the pitch."