While databases aim to index all the articles published in a journal, it is sometimes worth scanning key journals to look for other material such as advertisements, announcements and book reviews. This can be done online or from the print journal.
If you go to a journal's website you can also look through very recent articles, especially material made available online in advance of publication. These articles are often not indexed in databases or in OneSearch.
Library databases generally don't cover more ephemeral or informal publications such as newsletters from patient groups or industrial organisations. You may be able to access them through their website. Otherwise a trip to a library which holds a run of a particular newsletter or magazine may be required.
You may also need to "handsearch" individual websites to find reports, guidelines and policy documents.
To find a journal by title: