What is a Search and destroy missions during the Vietnam war?

The Viet War was not a war in which territorial gains were an issue...as they were in WWII (as one example). The strategy for success in Vietnam was to use "attrition" as a way of gaining victory. "Kill them all" (as the slogan went) until the enemy was gone; this was attrition. The tactic used was "searching for them & and then destroying them." Shortened to just "search and destroy."