"encontrar por casualidad" in English

to chance upon- to come across- to run into- to chance on

to find- to come across- to discover- to chase up- to alight on- to encounter- to meet- to pick up- to rout out- to run across- to run into- to spot- to strike- to strike- to stumble on- to track down- to work out- to stumble across- to come on- to come upon- to meet with

by- for- because of- through- via- for the sake of- per- of- out of- over- to- from- times- afterafter

a- the

chance- coincidence- casualness- haphazard- haphazardness- happenstance- accident- fluke- fortuitousness- fortuity