Partial mode

In Partial mode, results must contain text matching at least a certain number of user search query terms, according to the rules listed in this topic.

In Partial mode, results must contain text matching search query terms, according to the following rules:

The MIN_WORDS_INCLUDED setting specifies the minimum number of user query terms that each result must match. If there are not enough terms in the original query to satisfy this rule, then the entire query must match.
The MAX_WORDS_OMITTED setting specifies the maximum number of user query terms that can be ignored in the user query. If MAX_WORDS_OMITTED value is set to zero, any number of words can be ignored.

You can specify both of these settings with the PARTIAL_MATCH element in a SEARCH_INTERFACE configuration.

In Partial mode, result sets always include all of the results that an All query have produced, and possibly additional results as well.