Most databases have their own way of referring to the topics they cover. As you change databases, be prepared to change terms, as necessary. You may need to find different types of sources . Books are longer and broader in scope than journal and magazine articles, so the search terms required to find them are broader.
Articles explore narrower aspects of an issue and require narrower terms.
You may need to explore a subject over a period of time . Vocabulary may change to reflect attitude changes or a different knowledge base. In order to prepare for this, think of related terms for your key concepts.