Perhaps you should try some spelling variations:
"mars communication israel" » "mars communication issues", "mars communication iran", "mars communication iraq", "mass communication israel", "mass communications israel", "markets communication israel"
"et cooperation studies" » "et cooperation series", "et cooperation sources", "et cooperation implies", "et cooperations studies", "eu cooperation studies", "2 cooperation studies"
"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 israel") OR ("et cooperation studies"))) OR ("les relations history"))~.
• Removing quotes may allow a broader search: (((( mars communication israel ) or ( et cooperation studies ))) or ( les relations history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("mars communication israel") or ("et cooperation studies"))) or ("les relations history"))*.