Perhaps you should try some spelling variations:
research progression » research regression, research progress, research progresses
research profession » research professional, research professionals, research progressions
research professor » research process, research processes, research prozess

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((research professor) OR (research profession))) OR (research progression)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((research professor) OR (research profession))) or (research progression))".
• Adding a wildcard symbol may retrieve word variants: ((((research professor) OR (research profession))) or (research progression))*.