Often, you will get a lot of results → to get more relevant results, don't just conduct one search. Try using these ideas:
Consider alternative/similar forms of Keywords:
Example search: Irish immigration in America
1. Use synonyms or similar meanings: immigration / immigrants
2. Try different spellings & punctuation: Irish Americans / Irish-Americans / American Irish
3. Combine in different ways: Irish American immigration / American Irish immigrants
Different combinations...different results
Click on the each search icon to see the results
Irish Americans 
Irish Americans immigration
Irish Americans immigration indentured servitude
Irish indentured servitude
