Perhaps you should try some spelling variations:
professors » professor, professions
profession » professional, professor
professionals » professionalals, professorals, professional
professionalalism » professionalalalism, professoralalism, professionalisme, professionally, professionalizing
professionalism » professionalalism, professoralism, professional
demographics" » geographic"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: "((professors or (profession or professionals)) or ((professionalalism OR professionalism) or professoralalalalsal)): training, education and (demographics" or demographic")~.
• If you are trying to use Boolean operators, they must be ALL CAPS: "((professors OR (profession OR professionals)) OR ((professionalalism OR professionalism) OR professoralalalalsal)): training, education AND (demographics" or demographic").
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((professors or (profession or professionals)) or ((professionalalism OR professionalism) or professoralalalalsal)): training, education and (demographics\" or demographic\")".
• Removing quotes may allow a broader search: ((professors or (profession or professionals)) or ((professionalalism OR professionalism) or professoralalalalsal)): training, education and (demographics or demographic ).
• Adding a wildcard symbol may retrieve word variants: "((professors or (profession or professionals)) or ((professionalalism OR professionalism) or professoralalalalsal)): training, education and (demographics" or demographic")*.