Doing & thinking are two verbs you can't state a verb by verb, instead of saying I was doing some thinking you could simply say " I was thinking " that's much proper.
1) - He neither speaks German, nor having bachelor's degree / He doesn't speak German, and has no bachelor's degree.
2) - I do have bachelor's degree, but not master's, yet.
3) - The studies say, that a bad family is likely to have stoned kids, but doesn't have family meal.
Good luck !