Cài đặt Steam
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Báo cáo lỗi dịch thuật
However, you don't have a safe way to do that. You are not a game shop that could just ask the publisher to revoke a key, and Steam doesn't let you redeem a key into a gift (which could be traded through the Steam trading facilities, although that excludes the transfer of money).
steamtrades.com would be a good place to start, be sure to read and re-read every faq available. Don't expect to get money for them, though - best possible outcome is to swap for a cheap game you'd actually play. But if you are not prepared to spend a lot of time researching the subject, I strongly suggest you just gift them to your friends.