I'm looking for a name for a 'search target' that is hard to locate primarily because it cannot be described with a handful of key words or a particular phrase. The target of the search could be anything, but in this case it was a particular phenomenon or sequence of events.

This question came about because of the following events:

1. I was half way through entering a (programming) question in StackExchange, when the answer came to me. I didn't need to continue with the StackExchange question, but the process of typing out the question helped me answer it.   
I figured that this might be a common phenomenon with a name but could not think of a way to phrase a google search that might lead me to an answer.
2. This led me to wonder if there was a name for the phenomenon of not being able to find something simply because it's difficult to describe.

Once I have the answer to question 2 (this question), I can proceed to ask question 1. I hope that makes some sense.

(sadly phenomenon 1 did not happen as I typed this question)

EDIT: As I'm not particularly confident that words exist to describe these phenomena, and as I'm a Douglas Adams fan, I'm happy to accept 'Meaning of Liff' type names if they sound appropriate.

EDIT: Ungooglable is a good description of the thing I want a name for.