Yiddish: We're looking for a pin in a hay wagon.

Yiddish version of "a needle in a haystack."  SOURCE: Bernstein, Jüdische Sprichwörter und Redensarten. Variation: substitute "needle" (nodl|נאָדל) for "pin."   (photo source)

מיר זוךן אַ שפּילקע אין אַ וואָגן היי.

Mir zukhn a shpilke in a vogn hey.

We're looking for a pin in a hay wagon.