Boolean Search Techniques

Many electronic indexes allow us to combine our main concepts in various ways using the terms AND and OR and NOT.


1) Expanding your search:
By typing the word OR in between two different words, we can retrieve articles
containing either stress or anxiety.
Example: stress OR anxiety:

2) Narrowing your search
By typing the word AND in between two different words, we would retrieve only
those articles which included both of these concepts.
Example: stress AND anxiety:

3) Limiting your search :
By typing the word NOT in between two different words, we would retrieve articles on stress, but not any that mentioned anxiety.
Example: stress NOT anxiety: