HELP !!! :(

This text was translated by google!I really need help I've now bought two black ops for xbox 360 and now when I go to multiplayer and Forexample hardcore team detmatch Pick out one then examines the console lobby then comes checke lobby lobby and then try to join then come back 0 lobbys found then against 50 found lobbies lobbies lobbies 0 found and and and get Cheke goes on and on for hours like this and I can play someone looking nich tn what I can so that I can play? and NAT is open

tried to change your search preferences in the game mode menu?

I've already tried and does not work. pc runs on the game properly only on the xbox I have problems