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It's just somebody searching using the "and" operator, which can be the word "and" or a + sign.
They are either doing it because they don't know that the "and" is implied by a space, or because they are seeing if using the "and" will give them different results.
They probably read the guide that is in the advanced search page of most search engines, describing how to use "and" and "not". So they are trying it.
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