The phrase "fruitful collaboration" means working together in a way that is productive, successful, and beneficial for all involved parties. Full definition
We anticipate years of fruitful collaboration with our new colleagues. (thebreakthrough.org)
This approach can lead to a very fruitful collaboration between patient and clinician which, together with a clear explanation of the benefits and risks of medicines, promises to improve adherence and outcomes. (ebmh.bmj.com)
Since community clergy and religious groups are also interested in mental health there are many areas for fruitful collaboration. (religion-online.org)