Perhaps you should try some spelling variations:
"mars colonization failed" » "mars colonization still", "mars organizations failed", "mrsa colonization failed", "its colonization failed", "jews colonization failed"
"city cooperation history" » "city corporation history", "city federation history", "china cooperation history", "city corporations history"
"its communication iraq" » "its communication iran", "its communication israel", "its communication italy", "nets communication iraq", "c's communication iraq", "mass communication iraq"

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

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