You can enter one or more query terms separated by blanks. As a default, two or more query terms will be joined by "and", i.e. the search will retrieve all records containing (all) the query term(s). It is not relevant to the search in which record field the query term(s) occur(s). This makes it advisable to use this option for topic related searches or if a search based on a more specific category (e.g. person or title keyword) was unsuccessful.
Sloterdijk search result: citations in which Sloterdijk is specified as author or mentioned in the title or personal heading etc.
Unesco search result: citations in which UNESCO appears as a corporate body or in the title, the subtitle or reference source etc.