Advanced Search Strategies
Master advanced search techniques including Boolean logic, controlled vocabulary, and database-specific search features.
Most researchers use only a fraction of available search tools. Mastering advanced techniques dramatically expands your ability to find relevant, high-quality sources.
Boolean Logic in Depth
Boolean operators (AND, OR, NOT) can be combined with parentheses to create complex search strings. This is called nesting and allows precise control over search results.
(teenager OR adolescent) AND (social media OR Instagram OR TikTok) AND (mental health OR depression OR anxiety) — this finds sources about teenagers' mental health in relation to any of several social media platforms.
Controlled Vocabulary vs. Keywords
Library databases use controlled vocabulary — standardized subject headings — to describe content. Searching by subject heading finds all sources on a topic regardless of the specific words used. For example, the MeSH term "Adolescent" finds sources about teenagers, youth, and young people.
- Find controlled vocabulary by looking at the subject headings of a relevant source you have already found
- Use the database's thesaurus or subject heading browser
- Combine controlled vocabulary with keyword searches for comprehensive results
When you find a highly relevant source, check its bibliography for other relevant sources (backward chaining) and use Google Scholar or a database to find sources that cite it (forward chaining). This is often the most efficient way to find the best sources on a topic.
Ready to test your knowledge?
3 questions · Grade 8 level