If you are a regular user of Google, you may have seen the search suggestions whenever you search for anything. Google usually displays different search suggestions depends upon your actions. You can get suggestions that start with your keywords, whenever you type some keywords in the given search box. Once you have performed your search, Google will display a new type of suggestions that comprise your keywords, but not with prefixes.
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In this situation, Google will assume that the given search results are not satisfied and you are trying to find a query that brings better search results.