Terms for subject General containing do not matter

English	Russian
he could not do it, no matter how he tries	как он ни старался, он не мог этого сделать
not to do something as a matter of principle	пойти на принцип (m_rakova)
she did not give the matter even a passing thought	она совсем не занималась этим
she did not give the matter even a passing thought	она не придала этому значения
the persecution of scientists who do not conform to the official governmental opinion on a scientific matter	Лысенковщина