![](https://libapps.s3.amazonaws.com/accounts/4356/images/boolean-colonialism-racism.png)
Use the operator AND to narrow your search to sources that mention both terms.
American Colonialism AND Racism
This will yield fewer results than using either term on its own.
![](https://libapps.s3.amazonaws.com/accounts/4356/images/race-or-ethnicity.png)
Use the OR operator to expand your search with additional terms.
Race OR Ethnicity
This will yield more results than searching for just one term on its own.