Most every database relies upon Boolean searching. It is a structured means of creating a search "equation."
These three operators allow you to create complex queries that search for each component of your topic, while still allowing to search for synonyms or related terms to any or all of those components.
Disciplinary databases often have subject headings (a set of official terms used to describe something). For example, the American Psychological Association Thesaurus is a list of subject heading terms that are assigned to items indexed in the PsycINFO database. Subject heading searching can improve the relevance of your search results since other items in the database about that same thing will have the same subject heading.
Multidisciplinary databases like Web of Science do not have subject headings and must be searched with keywords.
Annual Reviews articles:
Literature review articles can be very helpful in providing background information for your research.
In order to find these articles quickly, add "Literature Review" OR "Review of the Literature" as a title field search in the database.
Or, if available, select the research methodology limit for "literature review".
Aside from searching databases by topic, another very important way of discovering research is using the reference list of articles and seeing who else has cited the article. How many times an article has been cited can tell you not only how influential an article has been, but can lead you to more articles on your topic.