Okay, so Google is never going to disclose WHAT the secret sauce of the infamous search algorithm actually is, but it does talk about how it likes to tinker with it.
Here, top Googlers explain the process they go through around 500 times a year to tweak different elements of the process here and there.
One example they use is the suggested search displayed when a user makes a spelling mistake.
Here is the clip:
httpv://www.youtube.com/watch?v=J5RZOU6vK4Q