okay, i watched your trailer and i'm going to be honest with you. the trailer sucks man!
doesn't say a thing about your movie or documentary or whatever it is.
first, you camera is not good. you don't see a thing when you are shooting from inside the car where your actors are. get a better camera first. look at the picture you posted up, that photography sucks man, you can't even see the fences clearly, play a little more with your camera. second, all i heard is the girl say "i can do it" when she was washing up. all you show is a motte keto, a nice looking girl and a car (naya toyota kinya bhanera dekhako?) and throw in a buncha text, where's dialogue? if you can't interest people with your trailer, no one's gonna watch the movie. and if you are shooting your subjects through your car windshield, make sure you wipe it clean next time. 
there's nothing good i can say about the trailer because it seriously need improvement. i feel like i just watched a clip composed by pasting together clips with some some random cars and people doing random things with random texts in between.
btw, you are good at working with aperture mode with your camera, but that just ain't enough.