An advanced search allows you to enter complex search queries using field codes, Boolean, and proximity operators to narrow the scope of your search.
Boolean Operators - Use Boolean operators to combine different search queries and proximity operators to find words near/within a specified distance of each other. Examples of Boolean Operators are: AND, OR, and NOT.
Field Codes - You can search for a term in a specific field by entering the field code in your advanced search. There are over 60 different field codes with which to search. Explanations of individual field codes appear in the search box when selected, otherwise you can also see an overview here.
Proximity Operators - You can choose between two proximity operators to find words within a certain distance from each other: Pre/n specifies a word order whereas W/n does not.