踏破铁鞋无觅处，得来全不费工夫。Your persistent search may prove futile, but a stroke of luck may lead you to a sudden discovery.

Literal translation: 

踏破——worn out

铁鞋——iron shoes

无——no

觅处——search for the right place

得来——get it

全——totally

不——no

费——to spend

工夫——efforts