CM 10.1 title word search - final

Hi all,

Running CM 10.1 Build 576 Patch1  Hotfix 1

When doing a title search, searching for central oval final returns an error Query expression too complex , results in multiple search criteria or operators.

final central oval works but central final oval does not.  central finals oval does work.

central oval final anything produces the error There is no default search method available for this query value.

Is final a keyword for something and can't be used?  I note that adding quotation marks around it works for searching.