Cannot find my friend game to spectate

We are playing with friends our private league. My 2 friends want to play and I want to spectate it. They are creating lobby with special title for example “elka” and I want to find it and spectate.
Almost always I can’t find it. Sometimes I can but only within few seconds when they click start the game. But only sometimes. If I don’t find it within these few second it is impossible to find it. What am I doing wrong?