So yes, I am searching for exactly that text "MEDIUSFLOW_FX_GET_DATA", and I know that exactly that text occurs within documents, but search says nothing found. Not sure I understand the bit about not being able to find anything where I have more than just "med"? I cannot search for "MEDIUSFLOW" for example?
But I know that I can search for "MEDIUSFLOW" for example, and I get a result with everything containing this (including results with "MEDIUSFLOW_FX_GET_DATA"). But if I search for "MEDIUSFLOW_" then it says nothing found - because as soon as I include an underscore it fails to find the text.