The search engine supports Boolean operators. These are words and characters which can help you search more effectively by allowing you to specify which words and letters are included in or excluded from the search.
The Search box is always visible in the top right corner of the page. You can perform Boolean searches in this box.
Alternatively, you can use the navigation menu on the left column of the page to choose Search and then select one of the more advanced search options which also support Boolean searches.
The tables below explains the functions of the various Boolean operators and special characters which can be used to search :
Boolean Operators and Special Characters
It is possible to combine these special search terms in various combinations, eg. "David Livingstone" AND Africa AND NOT "Henry Morton Stanley" finds results containing the exact phrase David Livingstone and the word Africa but not the exact phrase Henry Morton Stanley.
Similarly, canoe* OR kayak* would find results containing any of these words: canoe, canoes, canoeing, canoeist, canoeists, kayak, kayaks, kayaking, etc.
For even more complex searches use the advanced or fielded search to combine complex search terms.