The general settings for Search++ on this site have as much enabled as can be shown consistently and efficiently. The search experience you are receiving from the topnav search++ is the same as (2) below.
For comparison, the tabs here show search inputs and results for:
What you get without Search++
Searching on this site uses Search++, a highly enhanced search system for concrete5.
For example, the core search would find "Magic Tabs", but would return no results for any of:
Search++ handles full phrases and individual words, stemming, synonyms, abbreviations and acronyms, building a ranked search to list the best matches.
We also have a page showing a more direct comparison at Search Comparison.
If you would like to add similar enhanced searching to your concrete5 site, please contact me and we can discuss your search requirements.