Trening or Training: How To spell?
The word Trening is misspelled against Training, a noun meaning "The act of one who trains; the act or process of exercising, disciplining, etc.; education."
Word contains consecutive vowels 'AI' in between alphabets tr & ning is misspelled as 'E'Wrong Spelling:  tr-e-ning  Correct Spelling:  tr-ai-ning 
Find more wrongly spelled words of Training to spell it well.