máy bay bị bắn rớt 
the plan was shot down [ máy ] : (classifier for computers, radios); engine, machine, motor
[ bay ] : (1) to fly; (2) trowel; (3) you (plural); (4) to fade (of color)
[ bị ] : (1) bag, (knap)sack; (2) to suffer, undergo, experience, (suffering passive marker); (3) to prepare for in advance
[ bắn ] : (1) to fire, shoot, launch; (2) to splash
[ rớt ] : to fall, drop, crash (of a plane)
Most Common Compounds Set 1:
Most Common Compounds Set 2 :