To narrow and better target your results, use:
at least 3-4 keywords; must be different concepts, not synonyms.
safe-injection, Vancouver > safe injection sites, Vancouver, benefits
more specific keywords.
safe-injection sites, Insite, economic benefits
the limiters on the left.
Limit by date, item type, subjects, georgaphy and more.
“quotation marks” around phrases where you want an exact match.
safe-injection sites > "safe-injection sites"
use the drop-down menus to search by specific fields.
Search for your most important keywords in the title or abstract fields.
To expand your results, use:
video games, violence, teenagers, Canada > video games, violence, teenagers
video games > media, teenagers > children
synonyms with OR between.
"video games" OR "computer games", teenagers OR adolescents
* at the end of the word root to match all possible endings.
"video game*", child*, teen*
a different database.
Maybe the information you're looking for isn't indexed in Discovery.