You'll notice that most of your results are broad and cover a wide range of geographical locations, student groups and other topics.
This is where you focus your search.
Let's say you want to focus more on college students who want to fight for rights for Dreamers, or students who came to the United State who were very young, have no citizenship, but have lived in the country their entire life. How might college students organize on their behalf?
Now your keywords could be: college students, organizing, Dreamers, DACA, and immigration.