Perhaps you should try some spelling variations:
"research procedures" » "search procedures", "search procedure", "research proceedings"
"research professor" » "research profession", "research progresson", "research prozess"
"research processes" » "research projects", "research progress", "research practices", "research progresses", "research projectses", "research problemses"
"research process" » "research progress", "research projects", "research problems"
"research problem" » "research problems", "research program", "research progress"

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 process"))) OR ((((("research processes") OR ("research procedures"))) OR ("research problem")))).
• Removing quotes may allow a broader search: (((( research professor ) or ( research process ))) or ((((( research processes ) or ( research procedures ))) or ( research problem )))).
• Adding a wildcard symbol may retrieve word variants: (((("research professor") or ("research process"))) or ((((("research processes") or ("research procedures"))) or ("research problem"))))*.