bluebird of happiness
A set phrase from the play 'The Blue Bird' by Maurice Maeterlinck, symbolizing the search for happiness.
'The Blue Bird' is a fairy-tale play by Maeterlinck.
Search for the bluebird of happiness.
From the title of the play 'L'Oiseau bleu' (The Blue Bird) by Maurice Maeterlinck, translated into Japanese as 青い鳥.