This sheet is - as OP declares in the answer to a comment - a vietnamese song he copy from Youtube.
Ahh thanks a LOT. I was suspicious that the sheet is written wrong, like it can't be that HARD, but I wasn't sure. Now I can move on, shame this is my favourite
song (Vietnamese), I found only this sheet on Youtube.
It seems to be a midifile that has been imported in a notation program with a false time setting.
If we had the
a) the title of the song or
b) the midifile or
c) the youtube link from which OP has this incredible copy
we could and would like help.
I think I’ve got it!
This is the result of a wave to midi conversion or mp3 to sheet music transcription software.
As we can see these apps are still lightyears away from what you can learn in a few hours:
Play this simple tune by ear
Learn reading sheet music by writing it down
the rhythm doesn’t have to be as it is song. You can notate it in simple 4th notes! Starting in bar three with up beat:
Probably the chords of the l.h. (harmony / accompaniment) is post pond: look at bar 5!
We recognize the progression Am,,,Dm,,,G7,,,C,,, (root, fifth, octave: 1,5,8) that fits fine to the melody phrase above.
Again to the rhythm: mind that notation will never be 100% identical with the performance and vice versa, that means also a professional writer will never write notate music exactly how it is meant to be played, while a midi-notating program will be able to do so ... but nobody would be able to read it!