Don’t type in the Boolean operator AND when using more than one word in your search query—it’s applied automatically by the system. For example, cats dogs will return the same result as cats AND dogs.
Type and (in lowercase) if you want to retrieve records with ‘and’ in them—for example, lion witch and wardrobe.
Only records where both terms appear in the same keyword field will be retrieved—for example, for the search cats dogs, if one term is a Title Keyword and one is in the Notes, then that record won’t be retrieved. For these types of searches, use Advanced Search.
You must type in the Boolean operator OR in upper case when searching for records that contain either cats OR dogs.
Type or (in lowercase) if you want to retrieve records with ‘or’ in them—for example, good or evil will retrieve Uranium: for good or evil? / by Sir Frank Macfarlane Burnet (that is, records which have all 3 terms in them).
Use the minus sign (–) to indicate the Boolean operator NOT. Don’t type the word NOT into your search query—for example, cats–dogs.
When using NOT you may retrieve records that have, for example, the term Penguin on its own in one field, but Penguin Books in another—for example, 260 $b Penguin Books 490 $a Penguin Shakespeare Series. Use Advanced Search for NOT searches—for example, Any Keyword penguin NOT Any Keyword books.
For more information
For more information on Boolean operators, see: