There is a Facebook feature that allows anyone logged into a particular Facebook account to browse and clear their entire Facebook search history.
How to clear Facebook search history
The instructions and video detail how to delete your entire Facebook search history at once, or single Facebook search terms.
2. In the top right corner on your Facebook profile page, click the Activity Log button.
3. On the left side of the page, under the 3rd section (photos, likes, comments), click MORE to open additional selections.
4. On the bottom of the list click Search.
5. To clear your entire Facebook search history at once, click the Clear Searches link in the top right corner.
How to remove individual search terms
To remove individual searches, opposed to clearing the entire Facebook search history, click the icon on the right side of the searched term and click Remove when prompted.