Books may contain case studies as distinct chapters. To find these in CentralSearch, search for your topic and 'case study' and then filter the results by choosing Content Type > Book Chapter on the left-hand side of the results screen.
If you prefer to do a very broad search for book chapters, use WorldCat. The advanced search screen allows you to choose Format > Chapter. The library can request book chapters for you via InterLibrary Loan. These are delivered electronically as scans.