Nested Search - How do I use the online search tool to do this in PubMed: "(AuthorLastName AND (Keyword1 OR Keyword2))"

You can try the following, note this is only for searching PubMed and it does take two lines:

  1. Set the first field to “All fields” and enter the following without quotes “glycemic+OR+cholinergic”

  2. Set the connector to And and the second field to “Author (Smith, A.B.)” and enter “Billon”

This search should return 3 references.  Having the author information on the first line will produce different results.