The resettlement plan came at the order of Prime Minister Hun Sen earlier this month, following threats from the World Bank.
Some of those same NGOs have given their support to a highly public land dispute over a development project at Boeung Kak lake.
Villagers say their livelihoods there are being threatened by continuous government concessions to private rubber and other companies.
Human trafficking is estimated to be worth millions of dollars to criminal gangs across the region.
More than 100 villagers from rural areas detained by authorities in Phnom Penh after handing out leaflets detailing land concessions.
The titling came at the order of Prime Minister Hun Sen, following a threat by the World Bank that it would suspend funding.
The garment sector provides around 300,000 jobs and more than $2 billion a year in exports.
Up to 774 million adults lack functional literacy worldwide, according to the UN agency.
Flooding along the Mekong River in three provinces has claimed six lives and left hundreds of families homeless.
Throughout the draft process, a number of NGOs warned the law contains regulations that leave it open to political manipulation.
Cambodia exports labor to Japan, Malaysia, South Korea and Thailand especially.
Two years ago, the Boeung Kak lake area in central Phnom Penh was home to 4,000 families.
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