good progress, the system used by this food how does it work? and also any android application used by te food, I'm still confused

Right now Te-food is currently using a centralized database, which works well as long as they stay in select markets like Vietnam. But since they want to go global they're going to use a blockchain to keep cost down whilst at the same time keeping the quality of information up (from what I understand).

Te-food as multiple apps but the main ones for consumers are:

https://play.google.com/store/apps/details?id=com.teltd.tefood

https://itunes.apple.com/us/app/te-food-public/id1183733379?ls=1&mt=8

Additionally people don't have download their app as they integrated their tracking app with Zalo Messenger (which has 50 million+ users), Here's a video of how to access it through the messenger:
https://youtu.be/PzRi3Mb57vM

(The Zalo app itself https://play.google.com/store/apps/details?id=com.zing.zalo)

The rest can be seen here:

https://play.google.com/store/apps/developer?id=TE-FOOD