The statement comes as local groups say talks with the government over the law have yielded few changes to the draft.
The amendments to the law will give more power to the head of the Anti-Corruption Body, which has executive power.
Up to 1,500 families have had to leave the lake area to make way for a massive commercial and residential development.
Families say they were pushed from 352 hectares of land and forced to relocate to Preah Sihanouk province.
Cambodia has at least 62 unions that represent many of the nation’s 300,000 factory laborers.
The UN agency said nearly three in four children at orphanages have at least one parent.
The changes to the law come as officials work to bring it into full effect, including a declaration of assets by public servants.
Cambodian officials say they expect to begin initiating a 2009 law in April to bring the country in line with international standards.
Some callers to Monday night’s 'Hello VOA' program pointed to weak law enforcement and corrupt police.
A coalition of factory unions met Tuesday over the draft law, currently under consideration at the Ministry of Labor.
Cambodian women face a wide range of obstacles in their educational development.
Seven Phnom Penh officials led by Deputy Governor Noun Someth sat with 35 lake residents to discuss options.