Education 165 Biochemistry 109 Dissertations, Academic (Ph.D) 82 Mathematics 80 History 68 English language 67 Research 63 Education, Secondary 62 Thesis (Ph.D)-Education 60 Social sciences 58 Economics 57 Psychology 57 Students 51 Philosophy 47 Teaching 47 Education-Secondary 40 Study and teaching 39 Computer science 36 Social Sciences 36 Sociology 36 Language 35 Learning 35 Literature 35 Botany 34 Teacher-student relationships 34 Management 33 Special education 32 English literature 31 Methodology 31 Statistics 31