Mac Dictation (Mountain Lion) - Errors - are we able to make corrections?

Hi there I was wondering whether one of the clever folks can help me. Is there a way to edit the mistakes that mac dictate continues to make regarding speech input.

The support article: http://support.apple.com/kb/HT5449 states:

"The more you use Dictation, the better it understands you. Dictation learns the characteristics of your voice and adapts to your accent."

I have found this not to be the case, in fact quite the opposite, no matter how I may say a word it keeps giving me the incorrect word. For example 'Faith' will always come back as 'face'. 'End' always as 'and', etc.

As far as I can tell there is no way to correct these errors on the server? So how can it better understand me if it cannot be corrected?

Can anyone shed some light on this. Thank you.