HelpHELP !!! :(

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?

Try to portforward your xbox