is it possible to get an HK working visa

It’s possible for you to get it, but the premise is that you should find a job in HK.
The required documents contain the application form with a passport-style photo glued, copy of your passport, proof of your education certificate and work experience. Besides, your employer needs to provide the application form, the employment contract, business license, proof of financial support of the company, documents about company’s background, and the detailed business plan. Later, submit the application to the embassy of PRC to apply for it.
As long as you prepare all the documents, it may not be that difficult.