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I am a user, like yourself, so I don't know why the fields are there, not how they are used. I just don't try to search other then what I tried to show before.
I use the Online Family Finder Report that is part of the Family Tree Maker program. The results there are much better.
I am guessing that the search at Ancestry.Com is different as they may not have a search engine like the one that is within FTW.