1. Create a site.
2. Go to the site / Blog.
3. Create three blog entries named "aaa" , "bbb" and "ccc".
4. Type "aaa" in searchbox, then search. it can search the entry and there will show another searchbox.
5. Type "bbb" in searchbox, then search. use the portlet you used the first time, do not use the portlet that appears in the center of the page with the results.
6. Type "ccc", same as #5 step.
7. After, click "Back" button in the center of the page where the results are being displayed.
When click "Back", the page should go back to homepage, but after click "Back", it goes to the previous searched results.
If using the portlet in the center of the page to search after it appears, when clicking back it will take you to the blogs again.