How to ask in a polite way [closed]

I am an international student in the U.S.A. I am writing an email and I am stuck on one sentence. I would like to say:

"Do you know when I can get the flyers?"

I would like to make the sentence more polite. Could I say:

"Would you know when I could get the flyers?"

If there are other ways to use polite language, could you please tell me? If possible, please post an online reference as a citation.

Sorry, I forgot to mention about the situation or so on. I am writing an email to someone who is going to deliver the flyers and organize an event. I'm going to promote the event with the flyers. So technically, the person who I'm emailing is kind of my boss. Thus, I think I should write a polite email to him.

I am not sure what you are trying to convey and who the email is addressed to. But in any case, I would phrase your question the following way to make it less direct.

Would you mind telling me when I can get the flyers.

Please tell me when I can get the flyers.

I would like to know when I could get the flyers.

Can you tell me when I will get the flyers.

Can you tell me when I can get the flyers.

Could you tell when I would get the flyers.

That said, there are hundred of ways to ask a question and every single instance will depend on the context and situation you are dealing with.

More context would be useful, but in general, "Can I get...?" implies capability, while "May I have...?" implies permission. The latter is generally considered superior in both formality and politeness. I'd therefore probably say something like:

Do you know when I may have the flyers?