Search not finding certain pages

I use Be Communities' search bar to quickly locate articles so that I don't have to manually navigate to them. However, I was unable to successfully search for the following two pages even when using the keywords or titles:

Performing a Clean Installation
I tried searching for clean install, structural clean install, clean installation, and performing a clean installation. The closest I could get was an installation FAQ that referenced the desired Wiki page.

Troubleshooting License as Expired
I tried searching for license as expired, license expire, and troubleshooting license as expired.

Does anyone have any ideas as to why these are not appearing in the search results?