Use the advanced search to access your search history and create a search using the Search Builder, a way to to construct a search one concept at a time. To access the advanced search click on the Advanced link under the main search window.
The new Advanced Search Builder allows you to build a search term by term. You can choose a field (or leave it as All Fields) and add one or more terms to the query builder.
You can combine result sets using the search history numbers or access the results of previous searches by clicking on the number of results. You can easily combine keywords or full search sets with Boolean Operators AND, OR, or NOT.