English language 36 Study and teaching 29 Problems, exercises, etc 11 Foreign speakers 8 Grammar 7 Textbooks for foreign speakers 6 Textbooks for foreign speaker 5 Grammar, textbooks for foreign speakers 4 Mathematics 3 National security 3 Problems, exercise, etc 3 Englis language 2 Foreign relations 2 Military policy 2 Politics and government 2 Security, International 2 Spoken English 2 Textbook for foreign speakers 2 Asia 1 Case studies 1 Communication, International 1 Coup d'etat, 1965 1 Economic aspects 1 Electrical engineering 1 Examinations, questions, etc 1 Foreign economic relations 1 History 1 Indonesia 1 International law 1 International relations 1