The default Eclipse help browser allows you to limit text searches to specified modules in the help system. Use the Search scope link at the top of browser to define a named search scope.

You can also modify your searches by creating query statements or by expanding or limiting results. See Searching help in the Eclipse Workbench User Guide.

Also note that you can do an index search. On the Eclipse help browser, click on the index icon at the bottom of the Contents pane. The Index pane, which allows you to either search or browse the index, replaces the Contents pane