No one is going to give you advice on how to break the law, but a google search doesn't come up dry on nations full of illegal immigrants that tend to be overlooked unless they commit some grave crime or have a very serious political enemy. It's also worth knowing that strict immigration law and power of the government to enforce it don't really go hand in hand in many shitty 3rd world countries, and in some countries the law really only extends to bigger cities where federal police have power.