Gotta love america.

[Slendurrman]

Then how do Controlled Demolitions work? Luck?

I mean you can't control the angular velocity of explosion.
You can for the location.

Then how do they demolish a Los Angeles 4-story skyscraper that is less than 10 feet away from the nearest buildings?

The TYPE of the explosive is just as important as the location. Certain types can be made to go small and in one direction -- think fireworks.

Fireworks are projectile explosion, like a fuse bomb.