Gelukkige Onafhankelijkheidsdag is the word for Happy Independence Day. This is translation from English to Dutch.
Happy independence day?
boha maij dihcis
Maligayang Araw ng Kalayaan
Feliz dia da Independência.
happy Christmas
I would say: 'Happy thanksgiving'. Because Thanksgiving is an American holiday, not a Dutch, there is no specific translation for it.
'Le jour heureux d'indépendance'
Happy Christmas - vrolijk kerstfeest
Fröhlichen vierten Juli! or Fröhlichen Unabhängigkeitstag (=independence day)
happy birthday in dutch is fijne verjaardag
'Happy birthday' is 'fijne verjaardag' in Dutch.
Gelukkig Chanoeka.