Research theme for competitive and other funds (19)：
2018 - 2020 ヴェトナム黎朝期における明清法受容の実態(研究代表者)
2012 - 2016 再考・清化(タインホア)集団(研究代表者)
2012 - 2015 山から見たベトナム史(研究分担者)
2009 - 2011 The Research of Mac Government(Vietnam) based on collecting new historical materials and reexaminating existing materials
2008 - 2010 Spatial Composition of Power Centers in Medieval and Early-Modern Vietnam
2005 - 2009 The formation of order and local officials in the regions of East Asia : The explore of normative discourse and the actual situation
2005 - 2007 文献・碑文資料による近世紅河下部デルタ開拓史研究(研究代表者)
2003 - 2005 Unseen History of Southeast Asia : Deconstruction by Readings of Documents
2003 - 2004 A Study of Publishing Culture in East Asia Group B: "Study of Publications"
2002 - 2004 Historical Research on Inter Village Relations In Red River Delta
2001 - 2004 Published Books on Geography in Pre-Modern Vietnam
1996 - 1998 Historical Study on the "Dong ho" in the Red River Delta.
1997 - 黎朝期ベトナムの土地制度史研究(研究代表者)
1996 - 1996 前近代東南アジア史における「中心一周辺」関係の類型化(研究代表者)
1994 - 1996 Central and Regional Powers in Southeast Asian History
1995 - 1995 前近代東南アジア史における「中心-周辺」関係の類型化(研究代表者)
1993 - 1995 Land, Agriculture and Vollages in Early modern Vietnam
1990 - 1990 Historical Environmental Situation of Hoi An, a Port of Central Vietnam, in the South-China Sea Trade World
1989 - 1990 ヴェトナム黎朝前期の政権構造とその統治体制(研究代表者)
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Papers (56)：
"Period Division" and Law in Premodern Vietnam. Annual Report of the Chugoku-ShikokuAssociation for History and Geography. 2023. 18. 3-11
YAO Takao. The Military Exile (Sung quan) in the Le period, Viet Nam. The Journal of Hiroshima for Historical Studies. 2022. 311. 48-62
The transition of relegation system in the Le period, Vietnam. 2021. 52. 227-242
YAO Takao. Trends in the Study of Premodern Vietnamese Epigraphy as Historical Sources: Vietnam and Japan. Asian Research Trends New Series. 2018. 13. 31-50
The Commitment of Japanese to Modern Vietnam. Mizuha Nobuo (ed.), Thinking from Asia , Yuushi-sha. 2017. 252-270
Vietnamese Politics and Society in the Early Le Period (in Japanese)
2009 ISBN:9784903068121
Lectures and oral presentations (2)：
Some Comments on Bac su Thong luc
(The Symposium on Bac su Thong luc 2020)
When was the Final Official Version of the Le Code Compiled?
(5th International Cogress for Vietnamese Studies 2016)
Association Membership(s) (7)：
Japan Society of Southeast Asian Studies
, The Society of History and Geography in Tyugoku and Shikoku Area
, The Society of Hiroshima for Oriental Researches
, The Society of Hiroshima for Historical Studies
, The Society of Historical Research
, The Society of Oriental Researches
, Japan Society for Southeast Asian History
