damnhungry

Hi, I am a newbie to search algorithms. I was looking for a movie available on prime video app and the exact search term returns zero results. The same keyword works fine on amazon.com website and even searching for only one word returns results on the app. What makes the algorithm break for an in-app catalogue search like this? Another question being how do they build the search corpus for generic keywords like 'keanu reeves action movies'?

Screenshots from the app are here:

https://imgur.com/a/pK95Umx

Modern defense capabilities are highly dependent on use of computers to assess preparedness, cyber attacks, terrain analysis, operations management, etc. I am curious whether there are any startups that convinced the govt. to address these needs or it is the usual high level contractors (lockheed or such) competing for these services? What kind of military needs can be civilian* in nature, for example I know Amazon helps army with supply chain management for food supplies and other such things.

* - forgive me for the lame word placement here