Perhaps you should try some spelling variations:
"la cooperation studies" » "la cooperation series", "la cooperation sources", "la cooperation implies", "2 cooperation studies", "gulf cooperation studies", "area cooperation studies"
"mars communication iran" » "mass communication iran", "mass communications iran", "markets communication iran", "mars communication iraq", "mars communication ireland", "mars communication brands"
"les relations history" » "rules regulations history"

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: (((("mars communication iran") OR ("la cooperation studies"))) OR ("les relations history"))~.
• Removing quotes may allow a broader search: (((( mars communication iran ) or ( la cooperation studies ))) or ( les relations history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("mars communication iran") or ("la cooperation studies"))) or ("les relations history"))*.