How search engines treat dashes in titles?

Noticed that the search page titles are truncated after the long dash. It was an accident? How search engines treat dashes in titles?
June 27th 19 at 15:29
3 answers
June 27th 19 at 15:31
Try to type in Yandex:
resident is (there were 51 million results)
resident is (was 54 million results)
And the results different.
June 27th 19 at 15:33
June 27th 19 at 15:35
Correctly use an em dash in text format, this in the results with long dash, sometimes more than the result. The same wiki uses dash, not a minus.
To crop the header, it is necessary to crop.
Need examples, I don't think that the search engine catches this character. Maybe the code monkeys search crooked the regular season was, clearly prescribed marks, which is not included the dash. Again, hard to say, need examples, I have not seen this.

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