Hello we giai tri offline, we dev games 1. https://play.google.com/store/apps/details?id=com.giaitri.offline.samloc 2. https://play.google.com/store/apps/details?id=com.giaitri.offline.phomtala 3. https://play.google.com/store/apps/details?id=com.giaitri.offline.tienlen 4. https://play.google.com/store/apps/details?id=com.giaitri.offline.tusac