AND, OR, NOT allow you to limit or expand searches depending on your needs.
Wagner AND Friedrich (romantic painter Caspar David Friedrich)
piano OR klavier
Schumann NOT Elisabeth (early 20th century lyric soprano)
An important strategy to employ when searching phrasal concepts or conducting known-item searches for titles:
When pairing two or more keywords with another keyword, it is helfpul to "nest" the former terms within a larger Boolean search.
Truncation and Wildcards:
Most catalogs and databases enable users to search variations of keywords by using truncation (*) or wildcard (e.g., ?, $, !) symbols.