Which postcolonial theory would be the most suitable to apply to Chinese minority in Vietnam after 1975?

I second the motion on James C. Scott's Domination and the Arts of Resistance, and I'm thinking you might benefit from my essay "Conjuring Crypto-Jews in New Mexico" in Boundaries, Identity and Belonging in Modern Judaism, eds., Diemling and Ray, Routledge (2015).  It examines agenda-driven, academic adventurism in redefining the ethnic and genomic identity of a minority population without training in the requisite disciplines, and it touches on the consequences of  neo-colonialism in the region.