Perhaps you should try some spelling variations:
"slavery / best indies, british" » "slavery / west indies, british", "slavery / east indies, british", "slavery / west indie, british"
"slavery / west indien, british" » "slavery / west indies, british", "slavery / west indian, british", "slavery / west indians, british"

Try widening your search to All Fields.

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: "((\"slavery / best indies, british\") OR (\"slavery / west indien, british\"))".
• Removing quotes may allow a broader search: (( slavery / best indies, british ) OR ( slavery / west indien, british )).
• Adding a wildcard symbol may retrieve word variants: (("slavery / best indies, british") OR ("slavery / west indien, british"))*.