踏破铁鞋无觅处，得来全不费工夫
tà​pò​tiě​xié​wú​mì​chù, dé​lái​quán​bù​fèi​gōng​fu

serendipity

踏破铁鞋无觅处，得来全不费工夫 (踏破鐵鞋無覓處，得來全不費工夫) tà​pò​tiě​xié​wú​mì​chù, dé​lái​quán​bù​fèi​gōng​fu
serendipity
To search far and wide for something, only to find it by chance without effort.

Sources
Definitions
CC-CEDICT