Additional search parameters like "OR" and "NOT" offer a more fine grained search. For more information, Confluence offers a native help system (question mark).
Confluence will sort the results by relevance based on various idicators (keywords in titles, frequence of keywords, user recommendations, etc.).
Confluence will index all saved content. Within minutes, new content will be findable by the search.
If you are using Firefox or Internet Explorer 7 or later, you can add your Confluence site as a search provider, using the dropdown menu next to the browser's search box.
The example below shows the 'Extranet' Confluence site offered for inclusion as a search engine in the browser's search box.