OnTriggerStay/Enter/Exit for a second time?

how to do you get all of the OnTriggerEnter/stay/exit to search even after they have been activated. because currently my object is sensing everything properly but then stop searching as soon as it leaves. so when it enters again it does nothing. so how do i fix this to search for it a second time to ?

here is my code currently

 @HideInInspector 
 var targetAquired = false;
 
 function OnTriggerEnter (other : Collider) {
     
     if(other.gameObject.CompareTag ("enemy")){
         targetAquired = true;
         print("targetAquired");
     }
     
     else {
     targetAquired = false;
     print(targetAquired);
     }
 }

and then the exit code:

 function OnTriggerExit (other : Collider) {
 
 if(other.gameObject.CompareTag ("enemy")){
         targetAquired = false;
         print(targetAquired);
     }
 
 }