Why couldn't the United States Bomb its way to victory in vietnam?

The reading was about how important air power was in the modern war. Everyone wondered why the bombing did not win us victory in the united states and it was not because of the bombing but the decision makers that did. President Johnson had the united states start bombing North Vietnam in February 1965. Miltary officials thought that United States should have gone with operation rolling thunder which was to keep bombing north vietnam until it is completely destroyed but instead they made the military fight with one hand tied behind their backs. The president also had the military not bomb places where the other countries borders had lied since they did not want the other countries to have an issue with the united states. China and the Soviet Union helped North Vietnam by supplying them goods and merchandise such as rice. because of the support of those countries North Vietnam was able to stand against the bombing by the United States.

1) What did the North Vietnamese do when the United States bombed their bridges?

2) Do you think if the president went with operation Rolling thunder that things would have gone different for North Vietnam?