Think of other ways to express the ideas in your keywords. Using related terms to express key concepts will increase your search results.
Examples:
capital punishment -- death penalty
equal rights policy -- anti-discrimination
air pollution -- smog
health --well-being
BOOLEAN OPERATORS are words that connect search terms (or key words) to broaden or narrow the search results.
There are three types of boolean operators: AND, OR and NOT.
AND narrows your search results by limiting your results to those that contain both words connected with AND.
OR expands your search results by including results that contain one word, the other word, or both words.
NOT narrows your search results by limiting your results to those that contain the word you designate before NOT, but not the word after NOT.
Wildcard Symbol: ?
This symbol replaces one character. For example, the search for wom?n will find both women and woman. Wildcards are used when there are unknown or uncertain characters in your search term.
Truncation Symbol: *
This symbol is used to expand word endings.
Quotation Marks: " "
Quotation marks are used to keep multi-word phrases together, as a unit, and in the exact order they are written.
Example: "prescription drugs"
"plastic bags"
"environmental racism"
"civil liberties"
If we wanted to search for the term plastic bags, and did not use quotation marks, the search would retrieve results for plastic and results for bags, independent of each other.