At a meeting on Friday, lawmakers questioned the government's recent findings that claimed corruption in Vietnam is decreasing.
According to the report, the number of newly detected cases this year decreased by 31.6 percent year-on-year.
The number of newly prosecuted cases and suspects have also gone down, 23 and 28 percent respectively.
Corruption is decreasing, but it remains problematic, the government said in a report submitted to the National Assembly.
However, Tran Van Kiet, a representative from the southern province of Vinh Long didn't agree with the conclusion.
"Has the number of corruption cases decreased because corruption is actually decreasing, or because [agencies] don't dare to detect corruption?" he asked.
In fact, corruption is still strong.
Kiet cited that many construction works fail even before their construction was complete.
He went on to question other rates of corruption reported by the government.
According to the government, the rate of corruption cases was more than 30 percent at commune and district agencies, while central bodies reported the rate of 0.3 percent.
"I don't know whether to laugh or cry [about the rates]. I wonder if [the big gap between the rates] is because officials in localities are poor making them more susceptible to corruption, or because corruption at high levels is too complicated to be detected."
Nguyen Dinh Xuan, a representative from the southern province of Tay Ninh, meanwhile, proposed that the National Assembly amend the Anti-Corruption Law soon to include a stipulation requiring officials to declare their incomes and property holdings.
It's more important for officials holding high posts, Xuan stressed.