Perhaps you should try some spelling variations:
"jews colonization failed" » "jews colonization still", "jews organizations failed", "its colonization failed", "mars colonization failed", "re colonization failed"
"city cooperation sources" » "city cooperation series", "city cooperation studies", "city cooperation countries", "city corporation sources", "china cooperation sources", "city corporations sources"
"mars communication iran" » "mass communication iran", "mass communications iran", "markets communication iran", "mars communication iraq", "mars communication ireland", "mars communication brands"

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