Advanced Search option
Once you have selected the advanced search option, the search screen provides you with several search criteria fields, in which to specify your query. You can enter whatever number of terms you expect to see in the records you are looking for in each field. Most of the fields have an associated LIST button, which provides you with an index for the field (all possible values of the field). Each field is accompanied by the AND/OR combo box, which can be used to specify the Boolean operator between terms within the field.
All the fields, except for the first one, are preceded by the inter-field Boolean operators (AND/OR/NOT) - as shown below.