When searching for the databases, you can limit your search to the subject of urban schools. For a broad search try using
"Urban Education" OR "Urban Schools" OR "Disadvantaged Schools"
Also look at the subject headings for each database. Use the
Use a truncation symbol, such as ? or *, to find several words with the same root, for example:
child* (finds child, children, and childhood)
behavio?r (finds behavior and behaviour)