Any Vietnamese know why Vietnam has "tea" in the middle and "cha" in north or south on the map?
I spend 2 months in the north then lived for a few month in Saigon. I never came across people using anything other than "trà" (cha).
Vietnamese uses both "chè" and "trà". But for some reasons, for things like iced tea, bubble tea we only use "trà". For the traditional tea that serves in a teapot, either is fine.
What did you mean saying "tea in the middle"? I'm quite sure we Vietnamese only use "chè" or "trà", both variants are basically "cha" I think.
Sorry if I wasn't clear. Looking at the map, there are 6 dots over Vietnam. The 2 in the middle of Vietnam (around Hue and Danang I guess) are pink, for "te" as opposed to the other one which are blue, for "cha".