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"
"its colonization failed" » "its colonization still", "its organizations failed", "anti colonization failed", "jews colonization failed", "mars colonization failed"
"city cooperation sources" » "city cooperation series", "city cooperation studies", "city cooperation countries", "city corporation sources", "china cooperation sources", "city corporations sources"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("mars communication israel") or ((("its colonization failed") or ("city cooperation sources"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("mars communication israel") OR ((("its colonization failed") OR ("city cooperation sources")))).
• Removing quotes may allow a broader search: (( mars communication israel ) or ((( its colonization failed ) or ( city cooperation sources )))).
• Adding a wildcard symbol may retrieve word variants: (("mars communication israel") or ((("its colonization failed") or ("city cooperation sources"))))*.