Is there any way I can transfer stuff I purchased from iTunes on one account, to a new/other account?

Let's say I purchased 30 songs & 3 movies on an account with iTunes (let's call that account, account A) & now, 2 years later, I create a new account (account B) & now I want to keep my old stuff, the 30 songs & 3 movies, is there any possible way I can transfer my purchased items from account A to account B?

In general, no. Apple doesn't allow transfers between accounts. But if this is a situation where you created the second account due to losing access to the previous email address, forgetting the password, or a similar situation, and you can prove you're the same person, they may be able to get you access to the previous account again. Stop by your local Apple store or contact their customer support to see if there's anything that can be done in this specific situation.