Finding a primary original article isn't an issue of your search engine, it depends on the paper.
Using Google Scholar, Web of Science, PubMed, SciFinder will all give you the same papers. To find the primary original article you need to find the original article that the newer papers are citing which shouldn't be too hard if you take the time to read the paper.
Eg. if you're looking for the primary original article for the Bradford assay, then many many recent articles that used the Bradford assay will cite the original article (the one written by MM Bradford in 1970) when the assay was originally published.
What do they teach you kids in schools these days?
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Kevin Yin
Chemical Biology IV |Economics (minor)
President, McMaster Undergraduate Society for the Chemical Sciences
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