If the tourists have the visa stamp of Israel in the passport, to entry in Iran or Saudi Arabia is superbly hard
The small Kingdom in Himalaya is hard to come geographically. The only international airport is in Bhutan with 2235m height compared with the sea, and there are a few pilots good enough to fly there. Asking for the visa to Bhutan is not so easy. You must book with a tourist agency and pay the full package for the trip, including travel expense, permit fee, food and accommodation fee. The living cost in Bhutan is about 200-300usd/day, depending on the season.
This desert Kingdom is a wealthy country, but superb “proud” of the western people. Asking visa for the individual who is not Islam is rather difficult. If you had Israeli visa stamps in your passport, you might be denied immediately. The unmarried couple must travel in groups; women must be accompanied by a male relative, if the women go alone, there must be a relative or male guardian there. If your visa stamps are out of date, you will be fined to 3000usd.
This old colony of Italy in the Africa has been ranked the last position for Press freedom, even after the North Korea. This country does not welcome the foreign tourists, so asking a visa for Eritrea is very hard. It takes eight weeks to approve for a visa and may be refused at any time.
The smallest republic in the world is almost not for the tourists. There is only one flight from Naru to Australia every week. There are just nine embassies and consulates of Naru in the world, so asking for a visa for Naru is superbly hard.
As a nuclear hot spot, Iran is tough to visit for the tourists. Visa to Iran was approved by the Foreign Ministry in Tehran and could take a long time. The visitors are advised to submit the paperwork for a visa before the trip three months. US citizens will be fingerprinted at the customs, and have to travel in groups or a private tour guide. If the Israeli visa stamps in your passport, you cannot be allowed to enter Iran. However, the government of Hassan Rouhani President is promoting to reduce the visa procedures for the foreigners to attract the tourists.
The local people in Iran are very friendly with the visitors; especially you are from Vietnam.
It is a country very rich in oil and diamond, Angola gives the difficulties to the tourists to obtain a visa to limit job hunting in this country. It takes eight weeks for approving to get a visa to Angola, and require a lot of documents, including an invitation letter from a person or an organisation at the local, an uninfected certificate of yellow fever, the tourist must prove that he has 200usd/day at least during the time staying here