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a purely keyword search would not very useful. BTW semantic search engines can do exact keyword matches enclosing your query using double quotes e.g. https://www.google.com/search?q="keyword+search+engine".

Sadly, results #1 and #2 link to a page where the phrase "keyword search engine" isn't even present. So much for exact keyword matches.

But keywords with ranges would be useful in many cases.

keyword1 w5 keyword2 [...]

[find pages where keyword1 is within 5 words' distance of keyword2]

Google can do this. keyword1 AROUND(5) keyword2.

This gives me pages with the word "around" instead