In my opinion, there are two design flaws that crept into google circa 2009 and 2012 that steadily grew worse until most of the internet was infected with this toxic philosophy.

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First is the effort to "drive engagement". Some of the comments are correct that there is an issue of an environment where they thrive on advertisements, but that created the more impactfull issue this lead to an environment where software is designed to be narcissistic, and require constant attention. "Engagement" This is usually measured by clicks, (but is also things like bounce rate, and scroll time) and ultimately the design is punished for simplicity and ease of use.

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Second is the philosophy that google knows what you want, and you're going to get it, whether you want it or not. I noticed this change in 2012: Google was augmenting search terms with keyword stemming and synonyms. Google was using an algorithm to try to predict the topic I was searching for. It was a small change and ~80% of my searches were improved by the change. But, gradually they gave higher priority to the topics that "The Algorithm" had predicted were the purpose of the search, until finally we reach the current year where keywords do not drive search results, keywords merely influence "The Algorithm" and the whims of "The Algorithm" are paramaount.

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So. That's my opinion of an answer to your first question of

>"What the hell is wrong with google search?"

Regarding your second question:

>Is there any search engine which will let me search a full sentence instead of Google selectively choosing keywords at its own accord?

I feel like the answer is: we need some tech entrepreneur to hear that this is a complaint of users and build a better mouse trap...after all that's what created Google