HANOI, March 13 (Reuters) - Vietnam raised 11 trillion dong ($446 million) from 12 trillion dong of government bonds available at an auction on Wednesday, the largest volume raised in such auctions so far this year, as the finance ministry prioritises raising funds from domestic investors.

The amount raised at the auction on the Hanoi Stock Exchange was up from $324 million raised last week, the bourse said in a filing.

The State Treasury sold 3 trillion dong of 5-year bonds offered with a coupon of 1.47%, and 4 trillion dong each of 10-year and 15-year bonds with a 2.36% and 2.56% coupon, respectively.

It failed to sell any of the 500 billion dong in 20-year bonds and 500 billion dong in 30-year bonds offered.

"For the time being, the domestic market is more favourable for the Vietnamese government to mobilize funds with lower costs in comparison with those in international markets," said Hoang Hai of the finance ministry's debt management department.

"Therefore, in the short term, the Vietnamese government has plans to issue government bonds in the international bond markets," Hai told Reuters in an email. (Reporting by Khanh Vu; Editing by Kanupriya Kapoor)