Some issues

Firstly let's talk about how difficult it is to learn a second language. is for me. For me is hard because I don't have enough time to study. it. So I have studied English once, in a traditional language school, and I learned so much about grammar (but not enough), and I built up got a good vocabulary but for another other reasons I had to stop.
On this This year I discovered that the company in which I work would offer service to foreign company companies, and I would have to work with americans Americans, canadians Canadians and australians Australians guys. By At the moment I would have to learn English quickly.
Well thanks thank God I had no problem to communication communicate with them but I knew I needed to improve my English even they saying even if they did say "your English is good".
At the moment, I returned to the school to study.learn definitely. I'm doing my best but even this way I still thinking I'll never get it. I need to persist, I know that.
I just have looked for things such as " 10 ways to how learn a second language easily", there are a lot of these but any is none seem to be working for me.

Bionara's comments:

Good work! There's some interesting and fairly complex sentance structures - well done. Don't forget to capitolise proper nouns (country names for example). Language learning's a long and hard road - don't look for quick and easy ways...persevere! Speaking practice is the most important for "quick" improvement in my opinion so don't forget to do as much of that as you can :)

Some issues

First, let's talk about how difficult learning a second language is for me. For me, it is hard because I don't have enough time to study it. So I have studied English once in a traditional language school, and I learned so much about grammar (not enough) and got a good vocabulary, but for another other reasons I had to stop.
On This year I discovered that the company which I work I work for (or that I work for) would offer services to foreign companies (plural), and I would have to work with americans, canadians and australians guys. By the moment I would have to learn English quickly (I think you meant to say, "Now, I have to learn English quickly.").
Well thanks God I had no problem to communicating with them but I knew I needed to improve my English. Even though they said, "your English is good".
At the moment, I returned to the school to learn definitely (not sure what you meant, but definitely sounds weird). I'm doing my best but even this way I am still thinking I'll never get it. I need to persist, I know that.
I just have have just looked for things as like, " 10 ways to how learn a second language easily", there are a lot of these, but any is none are (or, "none of them are") working for me.

Some issues

Firstly, let's talk about how difficult learning a second language is for me. For me, it is hard because I don't have enough time to study it. So I have studied English once while in a traditional language school, and I learned so much about grammar (not enough) andgot a good vocabulary, but for another several reasons I had to stop.
On Earlier this year, I discovered that the company for which I work would offer its services to a foreign company, and I would have to work with americans, canadians and australians guys. By the moment As a result, I would have to learn English quickly.
Well, thank God I had no problem to communicating with them, but I knew I needed to improve my English even though they said "your English is good".
At the moment, I have returned to the school to learn English fully. I'm doing my best, but even this way I still think I may never get it. I need to persist, I know that.
I have looked for things to help me like " 10 ways to how learn a second language easily". There are a lot of these, but none is working for me.

I am not a native speaker, so I wrote base on your idea: 
Firstly let's talk about how difficult of learning a second language is with me. It’s hard because I don't have enough time to learn it. When I studied English in a traditional language school, I studied lots of grammar rules (but it’s still not enough), know many vocabularies but I had to stop studying because of some reasons.
This year the company which I have been working for will offer services to foreign companies, so I will work with Americans, Canadians and Australians guys. Therefore, I have to improve my English as much as possible.
Well, thank God, I have no problem when I communicate with them, but I know I need to improve my English, even though they said: "your English is good".
At the moment, I have returned to the school to learn English. Definitely I'm doing my best, but I still think that I may never get it (all English). I need to persist, I know that.
I have just looked for things which could help me like “10 ways to how learn a second language easily", there are a lot of ways but just several ways are work with me.

I know learning a language is not easy and you have to spend lots of time and effort to be able to communicate in that language. I have tried to practice English since May last year, i cannot count how many times i wanted to give up on English, but whenever i think about giving up on it, i think bout how many benefits English would bring to me. So, i take a day off from learning English and next day, I continue my learning. No matter how hard it is, just keep practicing and you will have what you want. I am positive.