The Market Surveillance Department has carried out 12,000 raids, 60% fewer than in the same period last year, but found nearly double the number of violations.
They have imposed fines and seized goods worth VND23 billion ($979,240), representing a 151% increase.
The seized items include household appliances, children's toys, supplements, helmets, food, and others.
The department also seized 12,321 counterfeit clothing items, shoes, handbags, wallets, watches, and phone accessories of brands like Rolex, Hublot, Hermes, Burberry, Dior, and Apple.
The department said increasingly sophisticated methods are being used, making it difficult for authorities to discover and crack down on violations.