I want to view a very old post in a Facebook page, e.g. this [page](https://www.facebook.com/TimHieuVeChienTranhVietNamVietNamWar), which contains hundreds to thousands of posts.

Browsing manually through the post stack of the page is so tiring and seems to be impossible for me to find that post.

How can I do a search for it like we do with a Google search?

I know we can search for our own posts via *Activity Log*, though for a Facebook page owned by others, what can we do?