Perhaps you should try some spelling variations:
"its colonization history" » "its communication history", "its organization history", "its cooperation history", "anti colonization history", "jews colonization history", "mrsa colonization history"
"africa organization case" » "african organizations case", "service organization case", "qaida organization case", "africa organization change", "africa organization a", "africa organization china"
"mars colonization failed" » "mars colonization still", "mars organizations failed", "mrsa colonization failed", "jews colonization failed", "pro colonization failed"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"africa organization case\") OR (\"mars colonization failed\"))) OR (\"its colonization history\"))~".
• Removing quotes may allow a broader search: (((( africa organization case ) OR ( mars colonization failed ))) OR ( its colonization history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("africa organization case") OR ("mars colonization failed"))) OR ("its colonization history"))*.