Sample Search 1: English as a National Language
Databases: Academic Search Complete, Education Source, ERIC, & OmniFile
line 1: "english language" (Subject Terms)
line 2: "language policy" or "government policy" or "english-only" (Subject Terms)
line 3: "united states" (Select a Field)
This search retrieved 197 peer reviewed citations.
Sample Search 2: Education for Indigenous Groups
Databases: Education Source, ERIC
line 1: education (Subject Terms)
line 2: hawaiians or "alaska natives" or "american indian" (Subject Terms)
line 3: "elementary schools" (Select a Field)
This search retrieved 103 citations, 33 of them peer reviewed. If you change the third line to "secondary schools" the respective results are 1,253 and 353 citations.
This sounds like an interesting article:
Scaffolding Language, Literacy, and Academic Content in English and Spanish: The Linguistic Highway from Mesoamerica to Southern California
Sample Search 3: Multicultural Education (generally)
Databases: Education Source, ERIC
This is a very broad topic so you will need to narrow your scope. Sample Search 2 is one example. Here are some Subject Terms (index terms) that might prove useful: