Perhaps you should try some spelling variations:
"box decolonization africa" » "box democratization africa", "_ decolonization africa", "war decolonization africa", "1945 decolonization africa"
"_ colonization history" » "_ communication history", "_ cooperation history", "_ civilization history", "_ decolonization history", "decolonization _ history"
"mars organization history" » "mars organization theory", "mass organization history", "mass organizations history", "arts organization 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: (((("box decolonization africa") OR ("_ colonization history"))) OR ("mars organization history"))~.
• Removing quotes may allow a broader search: (((( box decolonization africa ) or ( _ colonization history ))) or ( mars organization history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("box decolonization africa") or ("_ colonization history"))) or ("mars organization history"))*.