Databases typically allow you to limit or filter your search results in various ways. These may include:

• Date of publication (range searching)
• Language
• Publication Type (magazine, scholarly article, review articles)
• Peer-reviewed
• ​Document Type (proceedings, book chapter, etc.)
• Full-text availability

• Brainstorm your keywords for additional synonyms or related terms
• Expand your topic by removing filters
• Remove keywords from your search, dropping one concept from your strategy
• Use the Boolean operator "or" to add concepts and broaden your search