What is Bitcoin: http://en.wikipedia.org/wiki/Bitcoin
Earn Bitcoin easier with Bitbin: https://blockchain.info/wallet

Kiếm tiền với Bitcoin
http://bitcoinviet.com/kiem-bitcoin-de-dang-hon-voi-bitbin/
http://bitcoinviet.com/dao-bitcoin-truc-tuyen-ngay-tren-trinh-duyet/
http://bitcoinviet.com/huong-dan-dang-ky-tai-khoan-bitcoin-truc-tuyen-tai-blockchain-info/