A trademark has to have one basic feature that is it should be unique and create a brand identity for a product. So if a trademark is such that does not create any brand for a product can't be trademarked. A trademark should not be a conflicting trademarks with others. It means the trademarks should not create confusion between two trademarks. 

In general:

Trademark protection in Vietnam 

-Generic words can't be trademarked. For example you can't trademark the words like TV, Fridge, scooter, car etc.

-The names of the cities and countries can not be trademarked.

-The names of Gods and Godesses and the names of religious books can not be trademarked. For example you can't trademark *Lord Ram* or *Ramayana*

-Surnames can not be trademarked under normal circumstances. For Example you can't trademark *Sharma*

-Names of Constitutional Posts or Government posts can't be trademarked. For examples you can't trademark *Prime Minister of Vietnam

-Words which denote illegal or Immoral acts can't be trademarked. For example you can't trademark *Let's cheat* or *Let's grope*

-Words which are prohibited under names and emblems act can't be trademarked. For example, you can't trademark the official sign of Government of Vietnam.

Hope this helps!

Source: Quora

ANT Lawyers - IP services in Vietnam located in the business centers of Hanoi, Danang, Ho Chi Minh city. We provide convenient access to our clients. Please contact our lawyers in Vietnam for Trademark registration services in Vietnam via email ant@antlawyers.vn or call our office at +84 28 730 86 529.