Cambodian passport holder to obtain Chinese and Hong Kong Visa in Asean countries

Dear sir and Madam, my both visa Hong Kong and China completed stay ,I wish to re-apply in Malaysia when I take the flight AIRASIA through Malaysia.
Will I be able to apply in Chinese Embassy in Malaysia? in order to re -enter Hong Kong and Shen Zhen without flying up and down to Phnom Penh and I don't have resident permit just rent a house there . Your assistant is greatly help.

Thank you