Perhaps you should try some spelling variations:
"group cooperation studies" » "group cooperation series", "group cooperation sources", "group cooperation implies", "group operations studies", "global cooperation studies", "gulf cooperation studies"
"re organizations fad" » "re organizations a", "re organizations can", "re organizations d.d", "care organizations fad", "era organizations fad", "2 organizations fad"
"mars operation state" » "mars operations state", "mars operation stage", "mars cooperation state", "market operation state", "early operation state", "gas operations state"

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: (("group cooperation studies") OR ((("mars operation state") OR ("re organizations fad"))))~.
• Removing quotes may allow a broader search: (( group cooperation studies ) or ((( mars operation state ) or ( re organizations fad ))))~.
• Adding a wildcard symbol may retrieve word variants: (("group cooperation studies") or ((("mars operation state") or ("re organizations fad"))))*.