The Gallery search relies on correctly entered file names and proper search tags!
The search tags usually get neglected by uploaders and a Gallery Moderator will add search tags that come to mind at the time of validation.
A Moderator could search Google for similarities of apps, but it would be a very time consuming repetitive task.
For example: I have no idea what "Lync 2013" is as a app, I don't use it at all and never encountered it until You mentioned it - how and why should I know it is related to "Lync 2015" if I didn't know such a version exists as well.
Also, constantly editing search tags isn't really an option.
I try to edit, expand and equalize search tags whenever I realize a newly uploaded app is similar to another - but it is a endless loop as newer or similar versions of an app get added to the Gallery on a regular basis.
Lets not blow this out of water, especially considering that the app You gave as an example has been downloaded mere 3 times to date.
Enjoy the Gallery and Forum and be grateful for it!
Thank You for Your support.