All clips supplied by Microsoft (installed with Office or downloaded from Office Online) will have searchable keywords already related to them.
If you have other clips in Clip Organizer, it is unlikely that they have searchable keywords. Usually the keywords on clips stored on your hard disk are the names of all the folders under which the clips are stored. For example, if a clip is found in the My Documents\My Pictures\Sample Pictures folder, keywords such as My Documents, My Pictures, and Sample Pictures will be assigned to it, which isn't particularly useful.
As you've no doubt realized, the key to successfully finding clips is using the right keywords. You can edit keywords related to clips in both the Clip Art task pane and Clip Organizer. Just right–click your clip and click Edit Keywords.
Note The keywords on clips in the Office and Web Collections are not editable. But you can move the clips to other collections and add keywords there.
In Clip Organizer you can select more than one clip at a time by holding down the SHIFT key as you select the clips, which allows you to quickly edit the keywords for more than one related clip. You can tell whether you're editing one or many clips by looking at the tabs at the top of the dialog box (see the picture on the left).
Tip It's a good idea to get into the habit of editing keywords as you download clips so that you don't end up with lots of clips with keywords that you don't find useful.
Remember, keywords are a personal thing; they should be helpful for you.