Why not search twice. Once with all the words and then again with some of the words. Give a relevence score for each word matched and order descending.

I was under the impression that in SQL 2005 you could rename the SA account

ALTER LOGIN sa DISABLE;

ALTER LOGIN sa WITH NAME = 'New_Name';

ALTER LOGIN sa ENABLE;

Check BOL

I used the downloadable test exams from ucertify and preplogic