Number of search results at GitHub changes drastically from search to search

Question

I'm trying the following simple query: github.com/search?l=Gradle&q="android.support.test"&type=Code

But every time I run it I get a different number of total search results, varying from 200k results up to 700k.

What's going on here? Is there a way to obtain an exact result?

Answer 1

I now realize there is a question mark icon which when clicked shows the following text:

This search took too long to finish; some results may not be shown.

Thus, GitHub is cutting short the search query.