I know "research works" does not make sense. (I think I heard "works" is only used for art pieces.)
The problem is that I want to use "research work" to indicate multiple research articles. Can I simply assume it’s a collective noun and make a sentence like this?
The early research work focus on …
Answer
Yes and No
Early research work focused on….
"The" may or may not be correct dependent on context.
“Works” has a different meaning. It is used to describe construction or engineering projects.
E.g.:
There are traffic jams all over the city due to the road works in the centre.
Works on the bridge were delayed by 4 weeks due to bad weather.
The Works were signed off 6 months after the Completion Date.
So you should never use “works” to describe the work you do when you’re sitting at a desk.
Ref Works
Attribution
Source : Link , Question Author : Gwangmu Lee , Answer Author : Brad