Get different results with query on search index

Question

Hello, I am performing a search on my data. So, the scenario is that -

1. I query from the UI to which the search service is connected.
2. I get a few results example- links
3. If now I query again asking to get me some more links, then I get the same links again. I am adding prompt also that I need new links but still I get the same links.

I understand that the search service returns results ranked on scores but is there a way I can get different results every time? Also using boosters and scoring profiles might not help right because it will narrow down the results fetched. I understand using these features will make the output more predictable right.