Good day, what is the theme of your scientific project? Have known the theme I'll help you because in my university teachers of foreign languages and linguists are taught. I am the coordinator of such kinds projects.
Cooperation means help. There can be several co-authors for a research. You can help with ideas, writing literature review, collecting data for survey so on and so forth.
mostly coordination occurs between people in the same fields and areas of interest. Sometimes the initiative can be from your supervisor(s) to help you get involved in the research works... and other times I think depends on us which requires extra efforts by finding people whom interests are the same as ours, and then try to work on some joint project together.
If any Institution or Individual appointments you for their research, then you can work with them. Besides, you can do your own research as well and add one or more co-authors into that.