...
- Type in a query or search statement. Use the separate search boxes to enter different concepts.
- Some people prefer the Visual Search option.
- Add Rows to accommodate more than three concepts at a time.
- Use the * to truncate search terms. Example: therap* searches for therapy or therapies or therapeutical.
- Revisit searches done during a search session with the Search History/Alerts option
Limit/focus your search:
Before searching, choose limits from the default search page by scrolling down. Useful options include: Publication Type; Age Group, Language and Methodology. 
Or, opt for limits anytime during your search by clicking on Show More Refine your results box on the left hand side of the search page. 
Chose multiple options within each limit by using Indexes 
...