By default resources containing any term in the query are returned (i.e., OR is implied)
Make sure that a word exists in an resource by prefixing it with +; e.g., +library +access scholarly academic
Combine multiple words with AND to find resources containing all terms; e.g., education AND research
Exclude a word by prefixing it with - or NOT; e.g., online -politics or online NOT politics
Search for an exact phrase by putting it in quotes; e.g., "open access publishing".
Use parentheses to create more complex queries; e.g., archive ((library AND conference) NOT theses)