The Sai Sung, or sandworm, also goes under the other local name of Con May.

Its original residence is the island district of Van Hai, chiefly in the villages of Minh Chau and Quan Lan. The animals live in beaches, and the local population digs them out as the tide ebbs. Sái Sùng  digging requires experience and technique. The dug-out Sái Sùng  will be browned in fat and then eaten with fresh onions.

Dried Sai Sung, when roasted, has a yellow color and a salty sea odour. When dipped into chilli and mixed with leaves of Diep Ca (a strong-tasting vegetable), not to mention with a good beer, it is a local favourite.