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", "mars colonization history"
"early cooperation sara" » "early operation sara", "early cooperative sara", "energy cooperation sara", "early cooperation diana", "early cooperation early", "early cooperation scale"
"3 migration history" » "2 migration history", "der migration history"

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: "((\"3 migration history\") OR (((\"early cooperation sara\") OR (\"its colonization history\"))))~".
• Removing quotes may allow a broader search: (( 3 migration history ) OR ((( early cooperation sara ) OR ( its colonization history ))))~.
• Adding a wildcard symbol may retrieve word variants: (("3 migration history") OR ((("early cooperation sara") OR ("its colonization history"))))*.