Query android user dictionary return nothing

Query android user dictionary return nothing

I'm trying query words from UserDicionary but nothing is returned. What
I'm doing wrong?
here is my code:
Cursor cursor = getContentResolver().query(UserDictionary.Words.CONTENT_URI,
new String[] {UserDictionary.Words.WORD}, null, null, null);
cursor.moveToFirst();
while(cursor.moveToNext())
{
//nothing is logged...
Log.d("Palavra", cursor.getString(0));
}