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Select the most important 2-4 words related to your topic. Put the word AND between each new word or idea; this tells the database to look for resources with ALL your terms.
deforestation AND technology
Use quotation marks ( " " ) around phrases (two or more words); this tells the database to look for the words right next to each other.
"palm oil" AND deforestation AND technology
Use the asterisk (*) to truncate a word; this tells the database to look for all words that have the same base. In the example below, search results would include "governance" and "governing."
"drinking water" AND technology AND govern*
Use synonyms and related terms:
"global warming" AND"ice melt"
"global warming" AND glaciers
"global warming" AND "arctic ice"
Look at the number of results.
Too Many: Add keywords or be more specific.
Too Few: Change keywords or make them more broad.