Perseus and TLG (the Thesaurus Linguae Graecae) are not synonymous. The
Perseus site is fundamentally concerned with classical Greek culture; it
does have a Greek text database of classical Greek authors that is
licensed, I believe, from TLG, but that corpus that can be searched at the
Perseus site is a very small fragment of the entire TLG corpus of texts and
it (the Perseus corpus) certainly does not include Biblical or Patristic
materials, or even much of the philosophic literature beyond Plato and
Aristotle.
I don't know that it's possible to search the entire TLG corpus on-line
anywhere. You'd do best to check the TLG website itself:
Carl W. Conrad
Department of Classics, Washington University
One Brookings Drive, St. Louis, MO, USA 63130
(314) 935-4018
cwconrad@artsci.wustl.edu OR cwc@oui.com
WWW: http://www.artsci.wustl.edu/~cwconrad/