If you ever want to use google.com as search engine in chrome but google somehow seems to impose your national server you will have to change the search engine through your browser. Probably all that's required is to change the URL into
http://www.google.com/search?{google:RLZ}{google:acceptedSuggestion}{google:originalQueryForSuggestion}sourceid=chrome&ie={inputEncoding}&q=%s
