Oddities with Yandex

I decided now to search in Yandex one phone number. I thought maybe he was "lit up" somewhere. Number found!
Then I thought, maybe the request will be processed as an arithmetic example, but ... broken off)
Then I changed the query a bit ... And Yandex suffered - problems with encoding started)
It was possible to shorten the record to the following:

"+ 449-78 =" is such a simple query, without quotes.
Funny)

Post in a personal blog. If not interesting, minus it ... But not me, please)