Typically, I'd send Education students to ERIC, but I found more searching Library One Search (the default search on the library website), Academic Search Premier, or Wilson OmniFile. Points of View Reference Center and CQ Research may also help.
Databases will allow keyword searching, however depending on your word choice, it can be met with varying success.
I'd recommend a simple search such as Parkland shooting AND students rights
Then you can review the articles, abstracts, subject terms (left hand side or in the article record), to find different terms to search or add into your search to narrow.
Varying terms could be:
Douglas High School Massacre Student’s rights First amendment rights Protests Freedom of speech vs demonstrative protests (in response to Black’s dissent)
Though databases can accept phrase searching, they were built on (and thrive on) boolean search.