To find a document, you can perform a search using a title, author, editor, subject, collection etc...

An expression : You enclose your term in quotation marks Example : "second world war".

Search with boolean operators : you can use AND, OR NOT (written in uppercase) between words or expressions.
Example : volcano OR eruption
AND is used by default between words and expressions.
Example : earthquake Haïti = earthquake AND Haïti.

Search with partial word : you can use an asterisk to search for the root of a word. Example : atom*  search atome, atomes, atomique…