Perhaps you should try some spelling variations:
"slave trade / stress induces, british" » "slave trade / stress induced, british", "slave trade / stress indices, british", "slave trade / stresses induced, british"
"slave trade / test indies, british" » "slave trade / west indies, british", "slave trade / test induces, british", "slave trade / east indies, british"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("slave trade / test indies, british") OR ("slave trade / stress induces, british"))*.
• Removing quotes may allow a broader search: (( slave trade / test indies, british ) or ( slave trade / stress induces, british ))*.