See also:
Proximity searching |Truncation searching

Help: Boolean searching (AND, OR, NOT)

Boolean searching allows you to combine search terms using the three Boolean operators AND, OR and NOT. To execute a Boolean search, enter the required terms separated by the Boolean operators you wish to use.

When you transfer more than one search term from a browse index to a search box, Bertolt Brechts Werke automatically combines them using the Boolean operator OR.

You can use either the English operators AND, OR and NOT, or the German equivalents UND, ODER and NICHT.

AND

The AND operator retrieves all items which contain both of the terms it separates. This normally retrieves fewer hits than searching one of the terms on its own.

If you wish to search for the word 'und' (or 'and') in a phrase (and therefore do not want it to be a Boolean operator) you should type the phrase into the search box and enclose it in double quotes. For example "überrascht und verwirrt" will find the whole phrase 'überrascht und verwirrt'.

OR

The OR operator retrieves all items which contain either or both of the terms it separates. This retrieves more hits than searching one of the terms on its own.

If you wish to search for the word 'oder' (or 'or') in a phrase (and therefore do not want it to be a Boolean operator) you should type the phrase into the search box and enclose it in double quotes. For example: "Ursache oder Folge" will find the whole phrase 'Ursache oder Folge'.

NOT

The NOT operator retrieves all items that contain the first term entered but not the second.

If you wish to search for the word 'nicht' (or 'not') in a phrase (and therefore do not want it to be a Boolean operator) you should type the phrase into the search box and enclose it in double quotes. For example: "Liebe nicht Leidenschaft" will find the whole phrase 'Liebe nicht Leidenschaft'.


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