Update guide_vi.md
Update guide_vi.md
nguyennv/openpgp-zimlet,nguyennv/openpgp-secure-zimlet,nguyennv/openpgp-secure-zimlet,nguyennv/openpgp-zimlet,iwayvietnam/openpgp-secure-zimlet,nguyennv/openpgp-secure-zimlet,iwayvietnam/openpgp-secure-zimlet,nguyennv/openpgp-zimlet,iwayvietnam/openpgp-secure-zimlet