Perhaps you should try some spelling variations:
"research profession" » "research professional", "research progression", "research professionals"
"research professor" » "research process", "research processes", "research prozess"
"research projects" » "research project"

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 projects")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"research professor\") OR (\"research profession\"))) or (\"research projects\"))".
• Removing quotes may allow a broader search: (((( research professor ) OR ( research profession ))) or ( research projects )).
• Adding a wildcard symbol may retrieve word variants: (((("research professor") OR ("research profession"))) or ("research projects"))*.