He continued his father's policy of refusing to submit to the authority of the court in Hanoi, dominated at this time by his cousin Trịnh Tùng.

As time passed, Faifo became a major trade port for the south-west Pacific where traders in the region came to sell and acquire goods.

Originally the land of Faifo itself was not valuable, but later on the Nguyễn lords established various sugarcane and mullberry plantations to produce goods for overseas export.

As a result of this marriage, the Cambodian King allowed the Nguyễn to establish a small trading and tax post at Prei Nokor what is now Saigon in 1623.

After the negotiation, Chey Chettha II allowed to let them established the trading post which were namely Kas Krobei (Vũng Tàu) and Prei Nokor (Saigon) for taxation.

Nguyễn lords can bring their private army to protect the post and their citizens as well as the public security of the city of Prei Nokor.

At his behest the imperial court in Hanoi sent a formal demand to Nguyễn Phúc Nguyên to pay tribute and acknowledge the Lê emperor (and by extension, the Trịnh family) as his superiors.

Further, his defensive success in these first battles was a credit to his ability to attract talented men to his cause and make use of expert military advice and technologies, even if it came from foreign countries.