Search in collections: Click option search in the header

Use of the search screens
Use of input fields
Narrow a selection
Save a selection
Navigate in the output list

Look into reports: Click option reports in the header

Nation reports: How happy people are in particular nations
Rank reports: Differences in happiness across nations
Trend reports: Change of happiness over time within nations

Search entire database: Click option Search all: in the header.

Examples of how to find answers to questions about happiness in this source