Taken from one of my other posts:
"...kokyu which literally means, "breath out, breath in." Misogi allows us to discover a powerful form of kokyu-ho, or breathing method, which enables practitioners to develop kokyu-ryoku, or breath power.
can be translated to Breath-movements or moving with breathing.
translates to breath-throw.
Each term is very distinct, and should not be interchanged, per se. However, having said that, there may be cases where what the teacher is saying, for example "Let's do Kokyu-ho." and everyone goes and does Kokyu-dosa because that is how it is understood in that particular dojo or organization.