How does the Nintex Promapp Search Match and Rank the search results?

Matches and Partial Matches:

Results that match 50% or more of the terms will be returned.  results will be ordered in descending order based on the percentage of the terms matched i.e. 100% matches at the top, 50% matches at the bottom.

Ranking:

The ranking follows the following order:

1. The percentage of the terms matched
2. The attribute in which the criteria were matched
3. The type of result

The full help article can be found here Minimode | Promapp