That's the other thing - I've seen it being completely useless for me and then my coworker does the same search and it's fine for him, or vice versa. I imagine Google builds a profile of what it thinks you'd like to see and modifies your search query accordingly.

For this example in incognito mode without me logged in, results are similar, no problems. It is normal that it for changes results depending on user profile. Do you have other examples?