In addition to Google and Bing, there are other alternative search engines, such as 2Lingual, with which you can find content and facilities not available on Google.
Although the Google Search as well as other search engines support multiple languages, none can be searched at the same time two languages. In none but the 2Lingual.
What is interesting about 2Lingual is the fact that the basic technology search engine is Google Search, so you won't lose quality, but you'll get something extra that the standalone doesn't offer tool of Google.
Users can choose from a wide range of languages and have the results for two different search languages side by side. Of course, it also supports the Greek language. From our short experience with this tool, we can safely say that it works quite well, so we have none problem to recommend it.