Start by accessing the database on the library home page https://www.oit.edu/library.
Go to Electronic Resources and select the database from the list.
Select Advanced Search mode.
The Advanced Search brings you more options to combine your keywords, and also more options to limit the results to more relevant. For example, you can select date range, audience, type of publication, etc., before you search.
Type in your keywords in the search boxes. For example, "dental amalgams" and "safety". Do not try to type in a whole sentence.
This type of search will retrieve quite a few results, as it will look in several fields of article records: title, subjects and abstract.