Search Syntax: Wildcard: The query 'astro*' will find documents containing the words 'astronomy' as well as 'astrophysics'. And: The query 'red AND blue' will find the intersection of all documents containing the words 'red', and 'blue'. Or: The query 'red OR blue' will find the union of all the documents containing the words 'red' and 'blue'. Exclusion: The query 'red NOT green' will find the all the documents containing the word 'red', and excluding the documents containing the word 'green'.