HE AND THIEU STRESS THEIR UNITY; VAGUE ON ISSUES
Nguyen Van Thieu said to depart for Saigon with communique that appears to do little to relieve widespread uneasiness that prevails in S Vietnam over US intentions concerning war; seeks in brief s to quell speculation there are significant differences between US and S Vietnamese positions; expresses S Vietnam's gratitude for Amer sacrifices; communique discussed