Once you have conducted your search you can refine your search by using the options on the left - hand tab as follows:
Section Type - this refers to the type of document such as an article vs a case. You can filter this to only view the type you are searching for
Subject - this refers to the subject area within which it falls in such as company law
Titles - refers to where it is published so you can filter by title
Country Published - you can refine this to only look at specific countries' publication (such as South Africa)
State - this allows you to refine to a specific US state in which it is published in
Dates - you can refine to reflect certain periods (such as 2010 - date)