Although i am not yet fluent in english, i have noticed some mistakes in your letter.
1. we don't use abbreviations while writing formal letter (Kindly replace : ThankS by Thank you).
2. somewhere in your letter you wrote : ThankS to this. I think you should write '' Thank to this"
3. Where you wrote ''I would ask you to take my candidature into account'' According to me it is not polite. Try to be simple. I suggest you this phrase instead ''I would appreciate if my candidature is taken into account''
4. ''I am very determinated and hard-working person, as well as quick-learner and easygoing'' I think something is wrong in this sentence. You forgot to add ''a'' after ''very''
In fact just try to be simple and avoid using ''I'' abusively.
Hope this helps,
Thanks Omar for your intervention! Never do I get tired of receiving positive vibes, specially from these people who have similar philosophy in life. Hope I have always the necesary strenght to achieve whatever I really want. I bet you the same!
I do not know if you are an expert, but you demonstrate a great manage of the language :)
Why are you learning English? What is your purpose?