The following are several examples that will get you started:

• key* to find key, keying, keyhole, keyboard, and so on.
  

• sink** to find sink, sinking, sank, and sunk.

• surfing AND the Net will find matches that contain both surfing and the words the net.

• surfing NEAR the Net will find matches that contain both surfing and the words the net and order the results by how far apart they are from one another on the page.

• surfing AND NOT the Net  will find all instances of surfing but not the Net.

• Abbot OR Costello will find all pages that mention Abbott or Costello or both.

• Put quotation marks around keywords if you want the search to take them literally. For instance, if you type the following query:
  
  "system near manager"
  
  Index Server will literally look for the complete phrase system near manager. But if you type the same query without the quotation marks:
  
  system near manager
  
  Index Server searches all documents for the words system and manager.