Hanoi-based T&A has provided Ogilvy PR with local insight and links to Government clients, while Ogilvy has provided help with specialist areas such as financial and technology PR.
However, Alan Couldrey, regional director of Ogilvy Indochina, said T&A will remain a separate entity and both parties are free to pitch against one another.
Ten-year old T&A, founded by former journalist Nguyen Thanh Son, has 54 staff.