Perhaps you should try some spelling variations:
"re decolonization africa" » "re democratization africa", "_ decolonization africa", "re colonization africa", "box decolonization africa"
"_ communication united" » "_ telecommunication united"
"its colonization history" » "its communication history", "its organization history", "its cooperation history", "anti colonization history", "jews colonization history", "mars colonization history"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("re decolonization africa") OR ("_ communication united"))) OR ("its colonization history"))~.
• Removing quotes may allow a broader search: (((( re decolonization africa ) or ( _ communication united ))) or ( its colonization history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("re decolonization africa") or ("_ communication united"))) or ("its colonization history"))*.