It seems that on all our dnn installs (4.9.4) if you search using a term that is less than 5 characters it will not return anything, even if it's a valid search term.  5 characters and up is fine.  Is there a place to set the search term minimum length? 

mschepker-
This forum thread is probably lagging behind where you are on similar Twitter conversations by now but...
 
DNN doesn't care what the contents of a word are.  It will index the character sequence "zxcvb" as quickly as "amazon".  
 
Limitations
DNN search does not support phrases.  You can search for "Microsoft" or for "Word" but you cannot search for "Microsoft Word".  Actually, you CAN search for "Microsoft Word" but it treats the search as "Microsoft OR Word".  If you include the phrase in quotes your search term will be translated to:  "Microsoft Word"
 
By default, DNN search also does not support substring searches.  This means a search for "code" will not return results for "coder", "codes", etc.
 
Happily, substring searches can be easily enabled with a tweak of the stored procedure "GetSearchResults".  That tweak is detailed here:
 
   http://www.eguanasolutions.com/DNN_Blog/EntryID/38.aspx
 
 
Regarding the failure of "CRHP" to be indexed, I can't say that there is any bug or flaw I know of in DNN Search that would prevent that acronym from being indexed.  I have been similarly dissapointed with DNN search often enough to have switched to Google AJAX search for DNN sites with public content.  I posted an example for swapping the DNN search skin object for a custom Google AJAX search here:
 
   http://googleAJAXsearch.com
 
 
DNN search is very useful on a number of fronts but, for basic web page content searches, I find it still leaves much to be desired compared to the performance and results users are used to via Google.
 
-mamlin