As you begin your research, you will need to work on narrowing your topic.
Try combining terms to narrow your search results, eg, "immigrant AND children AND detention"
Using "AND" in between your search terms will narrow your search results.
Using "OR" will expand your search results, eg, "immigrant OR child"
Try using the * symbol at the end of root words to include the variety of representations in your results. Searching for "adolesc*" will include adolescent and adolescence in your results.
Finally, all of the databases provide facets or filter to narrow your search results. Try applying facets to narrow the publication date ranges, the article type, or publication titles in which the article appears.