Perhaps you should try some spelling variations:
"decolonization / test indies" » "decolonization / west indies", "decolonization / test induces", "decolonization / test index"
"decolonization / east indies" » "decolonization / east india", "decolonization / west indies"

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: "((\"decolonization / test indies\") OR (\"decolonization / east indies\"))".
• Removing quotes may allow a broader search: (( decolonization / test indies ) OR ( decolonization / east indies )).
• Adding a wildcard symbol may retrieve word variants: (("decolonization / test indies") OR ("decolonization / east indies"))*.