OR Google improves Search every year, training its algorithms to understand the language and environment to help you find exactly what you are looking for on the internet.
In one post on The Keyword, the Google describes in detail how in some searches the results in the Search are not as expected. In very few cases that the Google does not return the correct results, you will see the message: "There seems to be no search results" (It looks like there aren't any great matches for your search).
This message will be accompanied by some tips to help you further improve your search. The idea is that by providing more (and clearer) information, the Google will be able to turn her failures into successes. It will even provide alternative search terms to try.
OR Google obviously it will still provide results and it is up to you whether you use them or not. The company simply admits in advance that it may not deliver what you are looking for.
OR Google he essentially wants to point out that he is already using many methods to avoid this. For example, if you type something incorrectly, Search Google will detect spelling mistakes and provide results for the words and phrases he thinks you intended to type.
To be fair, the Google is usually great when it comes to helping you find what you are looking for on the web. This means that you are unlikely to ever see this message. However, in the strange case that the Google can not offer some results, do not be surprised.