...u leave that previous? what can i tell if i am changeling a job to new one that new employer ask usually why u leave that previous what can i answer
Firstly... please use better English than that when writing your cover letter and CV... if you can't then get someone else to write them for you or keep your current job!
I assume you're asking what you can tell an employer when they ask you why you left your old job. I would say that I left because I am looking for new challenges and want to learn new skills. I'd also add that you've always had an interest in whatever job it is that you're applying for.
Say either:
The distance was a problem
The travel was a problem - maybe took too long, or traffic, etc
You wanted work with better pay
A more challenging role
More mentally challenging role
You prefer this type of work..because
The hours at this job are better for me