View Search History
You can view your Search History at anytime by clicking Recent Activity in the My Dashboard menu. This is only for your current browser session! To navigate back to your search, use the back button in your browser.
Combine Searches
If you ran two (or more) separate searches you want to combine (out of the Headings, for example), this can be done using your Recent Activity. Anything currently in the search box will be added, so make sure those are empty if that is not your intention. Select the searches you want to combine and click Search with AND to look for both.
You can also use the Search with OR option to find either one, the other or both.