Question

How can I help you? or May I help you? which one is right?

Answer 1

I think that both are correct. I'm not completely sure though. ._.

Answer 2

Both are indeed correct, it depends in which sentence you use them.

Answer 3

Proper English would be, "How may I help you?"

Answer 4

it depends on content...
both are correct

Answer 5

depends on the situation .. but both are correct

Answer 6

Both are complete sentences and ask similar questions. :) If you're aiming for politeness, some people consider "May I help you?" to be more polite. If you wanted to go the extra mile and combine them, you could use "How may I help you?"