Hi Thomas ...
Open System Preferences > Spotlight then select the Search Results tab.
Select the all the categories for the search results you want.
Restart your Mac.
If that didn't help the Spotlight preferences may be corrupted.
Go to ~/LIbrary/Preferences
Move the com.apple.spotlight.plist file from the Preferences folder to the Trash.
edited by: cs
It's true that the various built-in search methods utilize the same Spotlight index, and in that sense they are all Spotlight searches. By "Finder Search" people generally mean the search window that you see when you either press command-F from Finder or start typing something into the box at the upper right of a Finder window, and when people use the term "Spotlight search" they often mean a "Spotlight menu search" - the use of the search icon on the far right of the menu bar at the top of the screen. The operational difference is mainly in the user interface - searching from a search window uses the same underlying Spotlight Index as searching from the Spotlight menu bar, but the input criteria can be more detailed, and the output is presented differently.
Here is another trick I found when doing an online search at the TAUW web site.
Use your up and down arrows to navigate through the Spotlight results list. (Do not click on items, that will open them). When the highlight is over the item you want, press Command-Enter (or Return).
This will actually open the enclosing folder and highlight the file you are looking for.