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​futà​pò​tiě​xié​wú​mì​chù​dé​lái​quán​bù​fèi​gōng​fū

to find something easily after an arduous search