Google Scholar is a free source that allows keyword searching of the full text of a wide range of articles, including legal journals. If an article is freely available, Google Scholar will frequently contain a link to the article. Google Scholar does provide an Advanced Search option. You may access it by selecting the three horizontal lines indicating the menu. From there, you can limit your search by author, journal, or date.
You may wish to combine a Google Scholar search with LibKeyNomad to access articles more easily. For more info on LibKey Nomad, go here: