Perhaps you should try some spelling variations:
research professor » research profession, research processes, research prozess
research problems » research progress, research program
research process » research progress, research program, research papers

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"research professor\\") or (((((\\"research process\\") or (\\"research projects\\"))) or (\\"((research problems) OR (research project))\\"))))\"".
• Removing quotes may allow a broader search: (( research professor ) or ((((( research process ) or ( research projects ))) or ( ((research problems) OR (research project)) )))).