Apparently they simply pass along your search query to Google and return to you what Google gives them.
The upside of using this search engine is that they do not record anything about you. Things that Google routinely records.
I compared a search between them and Google and the results returned were almost identical.
I just thought others here might find that useful as they search for things at Google.
Personally I am not affiliated with this search engine at all.
I do not like the power and influence that Google continues to take to itself and am always open to trying non-Google anything and to sharing with others what I find.