Configuring the Phrase module

Ranking based on sub-phrases
Subphrasing ranks results based on the length of their subphrase matches. In other words, results that match three terms are considered more relevant than results that match two terms, and so on.

About approximate matching
The approximate setting is appropriate in cases where the runtime performance of the standard Phrase module is inadequate because of large result contents and/or high site load.

Applying spelling correction, thesaurus, and stemming with the Phrase module
Describes available functions with query expansion enabled.

Editing Phrase module parameters
Edit phrase modules parameters from the Relevance Ranking Modules editor.

Summary of Phrase module option interactions
You should only use one Phrase module in any given search interface and set all of your options in it.