You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who controlled vietnam for more than a thousand years?" whose answer is Chinese.
Each document should contain about 30 words, and these documents should contain useful information.

Query: power that controlled Vietnam for more than a thousand years
Useful Output:

Doc 1: In the fall of 1945, French troops began arriving in Saigon. They quickly established control of the city and set out to reoccupy the entire country.
Doc 2: This September marks 75 years since the Vietnamese people, under the leadership of the Communist Party of Vietnam (CPV), overthrew 80 years of French colonial
Doc 3: It was through the south that the French first gained power in Vietnam, through the court of the Nguyen emperors. The French had been traveling to Vietnam since
Doc 4: During the 19th century, the French gained control of Vietnam, Cambodia, and Laos.  The country was ruled by the Chinese for over a thousand years before
Doc 5: In 111 BC the Han Dynasty formally annexed what was then called Nam Viet - and the country remained part of China for a thousand years. Vietnam