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

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"slavery / test indies, british\") OR (\"slavery / east indies, british\"))".
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• Adding a wildcard symbol may retrieve word variants: (("slavery / test indies, british") OR ("slavery / east indies, british"))*.