Perhaps you should try some spelling variations:
"re decolonization africa" » "re democratization africa", "_ decolonization africa", "re colonization africa", "box decolonization africa"
"human colonization history" » "human communication history", "human organization history", "human cooperation history", "human civilization history", "human cognition history"
"_ colonization israel" » "_ communication israel", "_ colonization still", "_ decolonization islam", "_ decolonization israel", "decolonization _ israel"

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