It was said in another thread (that you can't find without search) that BW turned off forum searching at the start of early access. No idea why.
But you can use Google! To say... search for forum entries about datacrons, in the search field put...
datacrons site:http://www.swtor.com/community
But beware, a fair number of the links won't go anywhere as the references were for the beta forums which no longer exist.