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The following tips are from support people who have helped users to understand Confluence search results.

Searching with quotes, for example searching for the string "Book One", does not look for an exact match like most search engines do. Rather, it looks for "Book AND One" and would return all matches where "One" is the first word after "Book" other than words considered to be stop words (a, the, an, etc.) This is explained in the following support request: http://jira.atlassian.com/browse/CONF-7148

It's not possible for Confluence search to return hits for "the best," as an example--with or without quotes, "the" is ignored.

Confluence uses the Apache Lucene search engine library

Searching for a string surrounded by quotes produces results with an exact match except for strings with stop words such as "the." Stop words are ignored.

As part of its tokenization process, Lucene strips out all punctuation from the search string, including although Confluence search now preserves  _ (underline) characters. Refer to the Confluence issue Allow search for words and phrases with non-letter symbols: plus (+), minus (-), period (.), dollar sign ($), asterisk (*), etc.