Requesting that your search results only appear in specific publication types is a good way to focus the results. Review articles tend to give an overview of the information relating to a requested topic. Editorial publications can be useful when seeking commentary on a topic of interest. Typical full-text database searching will find the specified words anywhere in the document, no matter how far apart. Documents where a needed word or phrase appear quite often are likely to contain relevant information.
Some databases contain a combination of full-text and citation documents.
A command can often be issued to limit the results to full-text articles. There may be times when you only wish to see documents published during a particular time frame. A command can often be issued to limit to a specified range of dates. Some full-text databases let you specify the size of the documents you wish to view. You can limit search results to documents containing a specified number of words.