Combine keywords and phrases:
- enclose phrases in quotation marks, e.g. "climate change"
- Combine keywords and phrases with AND, e.g. "climate change" AND policy
- include alternative terms in parentheses connected with OR, e.g. (policy OR legislation OR regulation)
- truncate terms with an asterisk to find variant endings, e.g., (Note: Don't truncate after just a few letters -- you will find too many unrelated terms. In addition, most databases will find plurals without the need for truncation.).
"healthcare policies" AND comparative
"maternal health" AND (policy OR system OR service)
"climate change" AND policy AND china AND russia