Sometimes, you might be interested on criticism on a literary genre or theme, rather than a particular work. This often happens when:
In general, books will be your best resource for this kind of search, because they are broader in scope than articles.
You will probably want to start with an "All Fields" search, but you may find that there are many subject headings with a structure like this:
"_______ in literature" or "Literature and ________"
You might use these to write about those particular topics. They may also be useful if you are working with one work in particular and want to see how it fits in with other works about, for instance, Venice, or consciousness.
Not every theme has its corresponding subject heading. However, subject headings can be immensely useful in identifying books whose titles might not include these words.
The catalog also classifies criticism of works based on genre. Genres can be broad or narrow. For example, these are all headings:
There are also headings for criticism using a particular critical approach:
You can use the Advanced Search to pair these genres with particular works, or you could do this kind of search on its own.
Sometimes it's also possible to look for criticism of authors who are somehow similar to the author in question.
For instance, there are many subject headings organizing both authors and literature by nationality, like this:
Literary movements are also useful subject headings:
Other facets of a writer's identity may also be subject headings:
Unfortunately, it's often difficult to guess exactly how this will appear in the headings; each of the patterns I've listed above is a possibility.
If you are searching for themes rather than criticism of particular works, I'd recommend using books! Broad topics of this kind are better covered in longer works! Articles are shorter and smaller in scope, so they tend to focus specifically on a work or a small group of works rather than the bigger picture.
You can do similar searches in some databases.
Still, if you are sure you want to use databases for this, here's some advice.