Try the market place of the Hare Krishna Index . Yes, you can. Just keep in mind that if you bookmark search results, you run the risk that in the long run these bookmarks may point to results that no longer exist. As long as you keep your custom lists general, you should be fine, though. You can construct your own link URL with the proper parameters.
Any combination is possible.
Keep in mind that the country specification overrides the continent specification. So even if you have specified Asia while requesting a listing for Germany, you will still get the listing for Germany.