Perhaps you should try some spelling variations:
"1945 decolonization models" » "1945 decolonization across", "1945 decolonization case", "_ decolonization models", "4.4 decolonisation models", "box decolonization models"
"1945 decolonization notes" » "1945 decolonization case", "1945 decolonization indonesia", "1945 decolonization across", "_ decolonization notes", "4.4 decolonisation notes", "box decolonization notes"
"re colonization still" » "re colonization failed", "re colonization israel", "re colonization songs", "pro colonization still", "_ colonization still", "jews colonization still"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("1945 decolonization notes") OR ("1945 decolonization models"))) or ("re colonization still"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("1945 decolonization notes") OR ("1945 decolonization models"))) OR ("re colonization still")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"1945 decolonization notes\") OR (\"1945 decolonization models\"))) or (\"re colonization still\"))".
• Removing quotes may allow a broader search: (((( 1945 decolonization notes ) OR ( 1945 decolonization models ))) or ( re colonization still )).
• Adding a wildcard symbol may retrieve word variants: (((("1945 decolonization notes") OR ("1945 decolonization models"))) or ("re colonization still"))*.