English language -- 173 Study and teaching 76 Congresses 49 Foreign relations -- 48 Management 41 Congresses -- 40 Interpersonal communication 38 more ... Self-presentation 36 Textbooks for foreign speakers 36 Politics and government 35 Grammar 34 History 32 Public speaking 32 Economic conditions 30 Communication 28 National security -- 27 Grammar -- 24 Foreign policy 23 Foreign relations 23 Terrorism -- 22 Negotiation 21 Security, International -- 21 Speeches, addresses, etc 21 Description and travel 20 Courses -- 19 English 19 International relations 19 Management -- 18 Politics and government -- 17 Closing ceremony 16 less ...