If the interviewer makes it clear that you are not suitable for their company, you can just get your resume back. If the interviewer just asks you to go back and wait for news, it's best not to take it back. Not an interviewer can decide whether to take you or not. They also want directors, ministers, business departments, human resources and even directors. If you take all your resumes, what will others see? Just listen to the interviewer brag about how good he is?