Begin with a keyword search and try various combinations. How you search can determine the number of results:
For example: “Winnie Mandela”
Using and narrows the search: Winnie Mandela AND apartheid
Using or broadens the search. : (Winnie OR Nelson) AND Mandela This search includes results for either Winnie or Nelson.
Winnie AND Nelson AND Mandela is a narrower search. It would show you results that mention both Nelson Mandela and Winnie Mandela. If it mentions only Winnie Mandela, it will be excluded from the results.
The BU Library Search also has many facets that can be used to refine your search in various ways.
For example, try searching only in the author field: Author search for Winnie Mandela
Using the options on the left-hand column, you could further limit your results in various way, for example choosing only article or using the date slider to see only material published before 1994.
The results provide a breakdown of books and articles on that topic and other similar subject headings you might want to investigate.
**** For more details see the Power Searching Guide****