To find resources on Catholic education in the catalog, select the "Subject" search on the Advanced Search page. Some of the terms you would use include "Catholic education," "Catholic schools," or "Catholic Church - Education."
Depending on your topic, you can narrow down your searching even further by adding subdivisions. You could also change the results by the format of the book, adding terms like "Encyclopedias," "Handbooks, manuals, etc.," and "Dictionaries" to the end, bringing back just those types of items.
Broadening your search could be beneficial as well, including such terms as "classroom," "nuns," and "ethics in education." Here are some example subject searches to get you started:
One hundred years of Catholic education : historical essays in honor of the centennial of the National Catholic Educational Association by 
An anthology of Catholic teaching on education by 
Catechist Companion: ready-to-use lesson plans : creed, sacraments, commandments, and saints by 
The law and Catholic schools : a guide to legal issues for the third millennium by L- Education (General)
LB- Theory and practice of education
LC- Special aspects of education