How should it be said in plural man doctors- men doctors - doctor for male doctors?

The correct plural form of "man doctor" is "men doctors".

"Men doctors" is the plural form of "man doctor" because it refers to more than one male doctor. The word "men" is the plural form of "man", and the word "doctors" is the plural form of "doctor".

The phrase "doctor for male doctors" is incorrect because it is not a plural form. It is a singular form that refers to a doctor who is a male.