Reports from local social insurance agencies reveal that nearly 2.4 million out of 12 million social insurance books were handed to Vietnamese labourers by June 30.Sluggish progress in insurance book transferring has been seen in some localities, VSIA official Chu Minh To said, adding that VSIA branches need to standardise data of social insurance participants in their management software.Vietnam has set a target of having half its labour workforce covered by social insurance by 2020.