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If you click on one of the words and it says "3/5 correct" it means 3 letters from that word belong to the correct word or password, all you need to do then is look for another word with those correct letters and eventually you should guess the right one.
PS: Take a look at the cheats for Fallout New Vegas here on Freeola, I found a way to get unlimited hack attempts, it also works on Fallout 3 :)