needle in a haystack ( synonym found)
Definition of needle in a haystack:

(n) : something that is difficult or impossible to locate; something impossibly complex or intractable
"you'll never find the paper you need on her desk. It's a needle in a haystack."
Definition of needle in a haystack:

(n) : something that is difficult or impossible to locate; something impossibly complex or intractable
"you'll never find the paper you need on her desk. It's a needle in a haystack."
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