Yes, the Vietnam Consulate in San Francisco issues multiple entry visas.
Multiple-year visas or certificate of visa exemption is a 5-year visa issued to Vietnamese nationals residing abroad, or foreigners who are spouses, or children of Vietnamese citizens.
The certificate of visa exemption might take the following forms:
1. A stamped certificate: A visa exemption certificate is stamped on the passports of Vietnamese nationals living abroad and foreign nationals to allow their entrance into Vietnam.
2. Detached Certificate: A visa exemption certificate is issued to Vietnam nationals living abroad under permanent resident’s permit granted by foreign authorities and holders of passports of foreign countries.