How do I search for tweets with accent?



I’m using Tweepy with search API to search for tweets containing some keywords that I’m interested in. For example, I created the search query as “Unión Europea” OR “U.E.” and specified lang = ‘es’. In this case I’m only getting tweets containing “Union Europea” OR “U.E.” but not those with the accented “Unión Europea”. When I tried the same query structure for keywords like “Europäische Union” in German, I got the correct words with accents. Could someone please give me some hint on why this might happen? I’m really confused why the same query method works for “ä” but not “ó”.

Thanks a lot. Any help would be appreciated.