Myanmar is a mess, both nation and football team. They weren't able to call many players based outseas (Thailand/Singapore mainly). For this match also 2 further absences Yan Naing Oo and also Than Htet Aung who was injured last match I guess.
This leaves Myanmar with very inexperienced squad and weaker than even normal. Tajikistan are not a bad team but dropped vital points against Kyrgyzstan and Myanmar so likes of Oman and Lebanon are already out of their reach. By winning this match they can void the result of that Myanmar match (because then Mongolia will climb above Myanmar and Kyrgyzstan have 2 wins against Mongolia) and maintain a faintest of chance to qualify for the next round.
Myanmar fans broken English message to their team is usually "fighting" but the team even in normal situations doesn't "fight". In this case I think Tajiks are 3 balls better even if don't take into consideration Burmese manner to react badly when going down.