Four men of the U.S. 11th Armored Cavalry Regiment were killed and 18 wounded Tuesday in fighting 66 miles ncrth of Saigon and five mUe« from the Cambodian frontier, spokesmen said. The Commu*iv «t troops left behind 52 bodies. 19 individual wejfMtttand 11 crew-served weapons. In another battle four miles from Cambodia. 32 guerrillas were killed, the command said. The Americans lost four dead and oicht wounded.