Perhaps you should try some spelling variations:
"re decolonization africa" » "re democratization africa", "re colonization africa", "box decolonization africa", "war decolonization africa"
"re communication history" » "re telecommunication history", "re communication sector", "re communication theory", "de communication history", "true communication history", "une communication history"
"_ decolonization still" » "_ colonization still", "_ decolonization models", "_ decolonization _", "decolonization _ still"

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 ("_ decolonization still"))) OR ("re communication history"))~.
• Removing quotes may allow a broader search: (((( re decolonization africa ) or ( _ decolonization still ))) or ( re communication history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("re decolonization africa") or ("_ decolonization still"))) or ("re communication history"))*.