Perhaps you should try some spelling variations:
"research progression" » "research progress", "research progresses", "research professional"
"research regression" » "research depression", "research session", "research regulation"
"research professor" » "research profession", "research process", "research prozess"
"research processes" » "research process", "research procedures", "research projects"

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