Perhaps you should try some spelling variations:
"_ cooperation strategy" » "_ conservation strategy", "_ population strategy", "_ adaptation strategy"
"its colonization history" » "its communication history", "its organization history", "its civilization history", "anti colonization history", "jews colonization history", "mars colonization history"
"city cooperation history" » "city corporation history", "city federation history", "china cooperation history", "city corporations history"

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

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