They are almost same.
We usually use"但是“and”可是“.
I think "但是"is stronger than”可是“.
2014년 7월 23일
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可是 = 但是 = but
不过 = 然而 = however
2014년 7월 21일
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可是 is a little more formal, softer and more common in the north of China than 但是. They can be shortened to 可 and 但 to make them more informal.
不过 is even more softer and informal.
There's very little difference between them.
2014년 7월 21일
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一样用法
2014년 7월 21일
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When we translate "but", we can use anyone of them. So they are almost the same.