Google Scholar is a good search engine for finding medical research papers. Here's what it shows searching for
"acetyl l carnitine alpha lipoic acid neuropathy" - https://scholar.google.com/scholar?hl=en&as_sdt=0%2C24&q=acetyl+l+carnitine+alpha+lipoic+acid+neuropathy&btnG=

You can select the year at the left column to sort the results to show the most recent papers found.