The Post Office in Dalat is located at 2 Le Dai Hanh. Generally, a parcel can reach Europe in under a week. To send a package, you will need to show your passport and fill out some forms. All packages entering Vietnam have to be checked by customs, so expect delays. And don't seal parcels before taking them to the post office. You will be required to show contents to customs before having your parcel weighed and priced.