Thien is one of the few internationally Chartered Architects in Vietnam today. He has over 25 years of experience working on large scale projects in many parts of the world including England, Norway, Canada, Bermuda, Africa, Dubai and Australia.

In Vietnam, Thien is registered as a Class 1 Architect and Masterplanner. He also sits on the Board of Director of the Vietnam Green Building Council.He has been engaged to lecture at the HCMC School of Architecture as well as mentor to the Curtins University Vietnam Programme. He is also a Lotus Accredited Professional who can professionally design and rate sustainable buildings in Vietnam following the VGBC green rating tool. Thien leads GroupGSA Vietnam acting as the bridge, connecting the Vietnam Studio with Australia.