The phrase "ago research" is not correct and does not make sense in written English.
It seems to be a combination of two separate concepts, "ago" which indicates a time in the past, and "research," which refers to the systematic investigation into a subject.
Example: "The research conducted five years ago revealed significant findings."
Alternatives: "previous research" or "earlier studies".
Twenty years ago, research on emotion regulation was almost non-existent.
Decades ago, research in animals showed that destroying nerves to the kidney, either surgically or with chemicals, sometimes prevented or reversed hypertension.
Forty years ago, research in science and technology was financed largely by the federal government, which was supposed to act in the public interest.
Ten years ago, research conducted by Seoul National University found that 92% of South Koreans considered unification "necessary", but by 2007 that figure had falled to 64%.
Forty years ago research showed that pesticides such as DDT harm human cells, but it was not banned in developed countries until 1972, and still accounts for one-third of American pesticide exports to developing countries.
Just a few weeks ago research from the Money Advice Service showed that around eight scam calls are placed every second from fraudsters purporting to be from the likes of banks, utilities companies and even HMRC".
I had a happy day some years ago researching Richard Dimbleby's famous Panorama April Fool on the Swiss sphaghetti harvest at the written archive centre in Caversham near Reading.
Four decades ago, researches began to employ state transition models to better understand the most complex processes in health care.
Because long-ago research indicated that a driver could damage his or her knee in a car accident, jamming it against the dash (and key).
A couple of weeks ago, a research paper by academic Rosalind Gill went viral.
Only a few years ago, drug research and education were the province of universities.
