Market Entry is not a simple thing. A major reason for failure by foreign start-ups and large corporates alike, who try to enter a foreign market, is their failure to understand that all markets are not the same.
Assuming that because your products or services sells well in your home market, they will also sell well in any foreign market. Quite often the research they base this on is tainted by their own bias and a belief that by simply duplicating what they do at home they can succeed abroad.