Perhaps you should try some spelling variations:
"et cooperation history" » "et corporation history", "et federation history", "et cooperations history", "eu cooperation history", "2 cooperation history"
"mars colonization failed" » "mars colonization still", "mars organizations failed", "mrsa colonization failed", "its colonization failed", "jews colonization failed"
"qaida organization case" » "africa organization case", "basin organization case", "based organization case", "qaida organization change", "qaida organization a", "qaida organization china"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("qaida organization case") OR ("mars colonization failed"))) OR ("et cooperation history"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"qaida organization case\") OR (\"mars colonization failed\"))) OR (\"et cooperation history\"))*".
• Removing quotes may allow a broader search: (((( qaida organization case ) OR ( mars colonization failed ))) OR ( et cooperation history ))*.