How to search Facebook for people, pages and groups.
Click in the search field to the right in the toolbar.
Click the down arrow to see recent searches, clear recent searches, or specify your search criteria for people, pages, groups, or posts.
The search window will display when you have entered at least 1 character in the search field.
If you choose to search by People you will also see a popup menu that gives you the option to search by location, workplace, or school.
Your seacrh results will show up in the main window.
You can revisit your most recent search results by selecting Last Results on the sidebar.
Search results are limited to a reasonable amount by Facebook.