You are most likely to find the individual you are looking for when you look for James Fitzpatrick Johnson. Chances are that you will not find many. Looking for information using a search engine is like that. The more keywords you can provide, the better chance of retrieving relevant information. This means that you can search on any word that appears on the website.
Directories are different.
Directory Directories are very much like a telephone book's yellow pages. In the yellow pages, businesses are listed by category such as restaurants, banks, hardware stores, etc. Internet directories do much the same. When you search at a directory, you are searching for keywords which appear in the title and description only. Many search sites use both search engine information and directory information to give you the best of both worlds.