Where can I find the names of Cognitive Disease I have checked the library, most popular search engines There are 3 diseases Please help

One is undoubtedly Alzheimer's.

http://scholar.google.com/scholar?q=cognitive+diseases+three&hl=en&btnG=Search&as_sdt=10000000000001&as_sdtp=on
Read widely among these results.

PS -- When you're searching for academic information, you'd be best off if you start here: http://scholar.google.com