"Anh trai của tôi không phải là một nghiên cứu sinh lười biếng."

Translation: My brother is not a lazy PhD student.

[StewartMM]

When did this change? It was "my brother is not a lazy researcher" only one month ago. Now it means PhD student???

One can do research without being in a PhD program or even being a student, so if "research" is the actual meaning, then it should be changed back to what it was (at least for the preferred definition).

[Raphael_SyBo]

Nghiên cứu sinh cũng có nghĩa là "postgraduate" phải không?

[TranVanHaiNam]

Yes, nearly like that.

[JamesTWils]

So, a fellow of a society, as in a postgraduate fellowship? In this context, most English speakers would simply see fellow as a synonym for person, guy.

[JudithWats]

"Research student" is common in the UK to include PhD students and some other students working at a roughly equivalent level. It should be accepted.

[ArthurRenn3]

Slow down