Also, any time after completing one or more searches, you can specify that the next search look only within the topics displayed ...

Also, any time after completing one or more searches, you can specify that the next search look only within the topics displayed from the previous search. To do this, select the "Search within previous results" check box just above Search Results. 

Note
This option affects only the search results displayed under "Suggested Topics" and "Help Topics."
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