Perhaps you should try some spelling variations:
"re decolonization across" » "re decolonization africa", "re decolonization case", "re decolonization from", "box decolonization across", "war decolonization across", "_ decolonisation across"
"_ decolonization still" » "_ colonization still", "_ decolonization africa", "_ decolonization models", "decolonization _ still"
"re colonization history" » "re communication history", "re organization history", "re cooperation history", "pro colonization history", "_ colonization history", "jews colonization history"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"re decolonization across\") OR (\"_ decolonization still\"))) OR (\"re colonization history\"))~".
• Removing quotes may allow a broader search: (((( re decolonization across ) OR ( _ decolonization still ))) OR ( re colonization history ))~.
• Adding a wildcard symbol may retrieve word variants: (((("re decolonization across") OR ("_ decolonization still"))) OR ("re colonization history"))*.