Narrow your search by making your search words more specific.
Instead of "world hunger," what aspect of world hunger are you interested in? Specific parts of the world or a country? Are you interested in causes of hunger, such as drought or famine?
Add these other concepts to your search by using the word AND to include more concepts.
Use NOT to eliminate undesirable results (for example, when searching for information about penguins, you might need to type NOT Pittsburgh, unless you are a hockey fan).
Let the database help you! Databases come equipped with options that let you slim down your results list. Look on the left or right of a results page for "limits" or "options" and limit by a more specific topic or date.