Perhaps you should try some spelling variations:
"research progresses" » "research progress", "research programmes", "research congresses"
"research projectses" » "research projects", "research projektes", "research project"
"research processes" » "research procedures", "research projects", "research progress", "research progresses", "research projectses", "research projectes"
"research problems" » "research progress", "research project", "research program"
"research process" » "research progress", "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 processes") OR ("research progresses"))) OR ("research problems"))) OR ("research projectses"))) OR ("research process")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"research processes\") OR (\"research progresses\"))) or (\"research problems\"))) or (\"research projectses\"))) or (\"research process\"))".
• Removing quotes may allow a broader search: (((((((( research processes ) OR ( research progresses ))) or ( research problems ))) or ( research projectses ))) or ( research process )).
• Adding a wildcard symbol may retrieve word variants: (((((((("research processes") OR ("research progresses"))) or ("research problems"))) or ("research projectses"))) or ("research process"))*.