research
Research is work that involves studying something and trying to discover facts about it. You say that someone does, conducts, or carries out research.
I had come to India to do some research into Anglo-Indian literature.
You can refer to the research that someone is doing as their research or their researches. You normally only use researches after a possessive form such as my, his, or Gordon's.
Soon after, Faraday began his researches into electricity.
Be careful
Don't talk about ‘a research’.
Don't talk about ‘a research’.