Really interesting and I bet there are very few people using Yandex as a search search engine, generally defaulting to Google or Bing, however Yandex offers a potentially time saving way of searching dates/times or other numeric search criteria pretty accurately! I shall certainly be using this one!
Finding several terms that are close to one another is a way to make the search results more relevant, i.e. make the search more semantic. This feature is called Proximity Search; it’s especially useful when searching on the web and in long, unstructured documents. A familiar example is to search for the word manage close to the word people, to find bios of those who have managed people, vs. profiles that just have both words somewhere in the text. Another example would be to look for a school name close to the year of graduation. Applications of proximity search are multiple