Hi, Newton! I enjoyed reading your experience with the claw machine! ^^ I wish I could be as lucky as you are when it comes to that. ^^ Here are my corrections. You could also apply these corrections next time. Good luck! :)
Yesterday, I did claw machine game.
>> Yesterday, I played the claw machine game.
I had only 2000 won.
>> correct! ^^
So, I had to do very carefully.
>> So, I had to play carefully.
The doll was under another doll.
>> This is correct. You can also say "The doll was under the other dolls", since the claw machine is full of dolls. ^^
I can get two dolls.
>> I could get two dolls at the same time.
(You are talking about the possibility of getting two dolls in one strike. Like the saying, "hitting two birds with one stone" ^^)
It was poketmon, named "Pokemon kkobugi".
>> It was pokemon kkobugi.
(You can also use the English term for that. " It was Squirtle.")
I did hard but it was failed.
>> I tried my best but I failed.
I was so angry, so I came to home and take money 4000 won.
>> I felt upset, so I went back home and took 4000 won.
But I failed.
>> correct!
So I wait and wait and my parents came.
>> I waited patiently for my parents to come home.
So, we went together.
>> And we went there together.
And we got 2 dolls.
>> correct!
Yehey!!!.
>>correct!
I felt fantastic, and I put on the doll in bag ring.
>> I felt fantastic and hung the doll on my bag.
I want to get another pokemon "Pyri".
>> I want to get pokemon Pyri next time.