If you're playing as GDI, and you have access to APCs and Engineers, then 
you can try this trick. Build 2 APCs, and put them each to a C-button. Now 
build 10 engineers, split hem into 2 groups of 5, put each group on a 
C-button, and load each group onto an APC. Now, drive the APCs over to the 
enemy base, and park them next to the NOD construction yard/barracks/airstrip. 
If the APCs are blown up, it's okay, the engineers will walk out still alive. 
Send all the engineers into NOD buildings, going into the construction yard 
first. Now, whenever you blow up a NOD building, they won't be able to replace 
it. And, if you captured their Hand of Nod or airstrip, then they won't be 
able to build any more units if you blow them all up.